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 <linux/vinline.h>
48 #include <asm/uaccess.h>
49 #include <asm/pgtable.h>
51 #include <asm/pgalloc.h>
53 #include <asm/div64.h>
55 #define LOAD_INT(x) ((x) >> FSHIFT)
56 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
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.
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_blkdev_list(char *);
67 extern int get_filesystem_list(char *);
68 extern int get_exec_domain_list(char *);
69 extern int get_dma_list(char *);
70 extern int get_locks_status (char *, char **, off_t, int);
71 #ifdef CONFIG_SGI_DS1286
72 extern int get_ds1286_status(char *);
75 static int proc_calc_metrics(char *page, char **start, off_t off,
76 int count, int *eof, int len)
78 if (len <= off+count) *eof = 1;
81 if (len>count) len = count;
86 static int loadavg_read_proc(char *page, char **start, off_t off,
87 int count, int *eof, void *data)
92 a = avenrun[0] + (FIXED_1/200);
93 b = avenrun[1] + (FIXED_1/200);
94 c = avenrun[2] + (FIXED_1/200);
95 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
96 LOAD_INT(a), LOAD_FRAC(a),
97 LOAD_INT(b), LOAD_FRAC(b),
98 LOAD_INT(c), LOAD_FRAC(c),
99 nr_running(), nr_threads, last_pid);
100 return proc_calc_metrics(page, start, off, count, eof, len);
103 struct vmalloc_info {
105 unsigned long largest_chunk;
108 static struct vmalloc_info get_vmalloc_info(void)
110 unsigned long prev_end = VMALLOC_START;
111 struct vm_struct* vma;
112 struct vmalloc_info vmi;
115 read_lock(&vmlist_lock);
118 vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
120 vmi.largest_chunk = 0;
122 for (vma = vmlist; vma; vma = vma->next) {
123 unsigned long free_area_size =
124 (unsigned long)vma->addr - prev_end;
125 vmi.used += vma->size;
126 if (vmi.largest_chunk < free_area_size )
128 vmi.largest_chunk = free_area_size;
129 prev_end = vma->size + (unsigned long)vma->addr;
131 if(VMALLOC_END-prev_end > vmi.largest_chunk)
132 vmi.largest_chunk = VMALLOC_END-prev_end;
134 read_unlock(&vmlist_lock);
138 static int uptime_read_proc(char *page, char **start, off_t off,
139 int count, int *eof, void *data)
141 struct timespec uptime;
142 struct timespec idle;
144 u64 idle_jiffies = init_task.utime + init_task.stime;
146 do_posix_clock_monotonic_gettime(&uptime);
147 jiffies_to_timespec(idle_jiffies, &idle);
148 if (vx_flags(VXF_VIRT_UPTIME, 0))
149 vx_vsi_uptime(&uptime, &idle);
151 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
152 (unsigned long) uptime.tv_sec,
153 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
154 (unsigned long) idle.tv_sec,
155 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
157 return proc_calc_metrics(page, start, off, count, eof, len);
160 static int meminfo_read_proc(char *page, char **start, off_t off,
161 int count, int *eof, void *data)
165 struct page_state ps;
166 unsigned long inactive;
167 unsigned long active;
170 struct vmalloc_info vmi;
173 get_zone_counts(&active, &inactive, &free);
176 * display in kilobytes.
178 #define K(x) ((x) << (PAGE_SHIFT - 10))
181 committed = atomic_read(&vm_committed_space);
183 vmtot = (VMALLOC_END-VMALLOC_START)>>10;
184 vmi = get_vmalloc_info();
186 vmi.largest_chunk >>= 10;
189 * Tagged format, for easy grepping and expansion.
192 "MemTotal: %8lu kB\n"
196 "SwapCached: %8lu kB\n"
198 "Inactive: %8lu kB\n"
199 "HighTotal: %8lu kB\n"
200 "HighFree: %8lu kB\n"
201 "LowTotal: %8lu kB\n"
203 "SwapTotal: %8lu kB\n"
204 "SwapFree: %8lu kB\n"
206 "Writeback: %8lu kB\n"
209 "Committed_AS: %8u kB\n"
210 "PageTables: %8lu kB\n"
211 "VmallocTotal: %8lu kB\n"
212 "VmallocUsed: %8lu kB\n"
213 "VmallocChunk: %8lu kB\n",
217 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
218 K(total_swapcache_pages),
223 K(i.totalram-i.totalhigh),
224 K(i.freeram-i.freehigh),
232 K(ps.nr_page_table_pages),
238 len += hugetlb_report_meminfo(page + len);
240 return proc_calc_metrics(page, start, off, count, eof, len);
244 extern struct seq_operations fragmentation_op;
245 static int fragmentation_open(struct inode *inode, struct file *file)
248 return seq_open(file, &fragmentation_op);
251 static struct file_operations fragmentation_file_operations = {
252 .open = fragmentation_open,
255 .release = seq_release,
258 static int version_read_proc(char *page, char **start, off_t off,
259 int count, int *eof, void *data)
261 extern char *linux_banner;
264 strcpy(page, linux_banner);
266 return proc_calc_metrics(page, start, off, count, eof, len);
269 extern struct seq_operations cpuinfo_op;
270 static int cpuinfo_open(struct inode *inode, struct file *file)
272 return seq_open(file, &cpuinfo_op);
274 static struct file_operations proc_cpuinfo_operations = {
275 .open = cpuinfo_open,
278 .release = seq_release,
281 extern struct seq_operations vmstat_op;
282 static int vmstat_open(struct inode *inode, struct file *file)
284 return seq_open(file, &vmstat_op);
286 static struct file_operations proc_vmstat_file_operations = {
290 .release = seq_release,
293 #ifdef CONFIG_PROC_HARDWARE
294 static int hardware_read_proc(char *page, char **start, off_t off,
295 int count, int *eof, void *data)
297 int len = get_hardware_list(page);
298 return proc_calc_metrics(page, start, off, count, eof, len);
302 #ifdef CONFIG_STRAM_PROC
303 static int stram_read_proc(char *page, char **start, off_t off,
304 int count, int *eof, void *data)
306 int len = get_stram_list(page);
307 return proc_calc_metrics(page, start, off, count, eof, len);
311 extern struct seq_operations partitions_op;
312 static int partitions_open(struct inode *inode, struct file *file)
314 return seq_open(file, &partitions_op);
316 static struct file_operations proc_partitions_operations = {
317 .open = partitions_open,
320 .release = seq_release,
323 extern struct seq_operations diskstats_op;
324 static int diskstats_open(struct inode *inode, struct file *file)
326 return seq_open(file, &diskstats_op);
328 static struct file_operations proc_diskstats_operations = {
329 .open = diskstats_open,
332 .release = seq_release,
335 #ifdef CONFIG_MODULES
336 extern struct seq_operations modules_op;
337 static int modules_open(struct inode *inode, struct file *file)
339 return seq_open(file, &modules_op);
341 static struct file_operations proc_modules_operations = {
342 .open = modules_open,
345 .release = seq_release,
349 extern struct seq_operations slabinfo_op;
350 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
351 static int slabinfo_open(struct inode *inode, struct file *file)
353 return seq_open(file, &slabinfo_op);
355 static struct file_operations proc_slabinfo_operations = {
356 .open = slabinfo_open,
358 .write = slabinfo_write,
360 .release = seq_release,
363 int show_stat(struct seq_file *p, void *v)
366 extern unsigned long total_forks;
368 u64 sum = 0, user = 0, nice = 0, system = 0,
369 idle = 0, iowait = 0, irq = 0, softirq = 0;
371 jif = - wall_to_monotonic.tv_sec;
372 if (wall_to_monotonic.tv_nsec)
378 user += kstat_cpu(i).cpustat.user;
379 nice += kstat_cpu(i).cpustat.nice;
380 system += kstat_cpu(i).cpustat.system;
381 idle += kstat_cpu(i).cpustat.idle;
382 iowait += kstat_cpu(i).cpustat.iowait;
383 irq += kstat_cpu(i).cpustat.irq;
384 softirq += kstat_cpu(i).cpustat.softirq;
385 for (j = 0 ; j < NR_IRQS ; j++)
386 sum += kstat_cpu(i).irqs[j];
389 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu\n",
390 (unsigned long long)jiffies_64_to_clock_t(user),
391 (unsigned long long)jiffies_64_to_clock_t(nice),
392 (unsigned long long)jiffies_64_to_clock_t(system),
393 (unsigned long long)jiffies_64_to_clock_t(idle),
394 (unsigned long long)jiffies_64_to_clock_t(iowait),
395 (unsigned long long)jiffies_64_to_clock_t(irq),
396 (unsigned long long)jiffies_64_to_clock_t(softirq));
399 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
400 user = kstat_cpu(i).cpustat.user;
401 nice = kstat_cpu(i).cpustat.nice;
402 system = kstat_cpu(i).cpustat.system;
403 idle = kstat_cpu(i).cpustat.idle;
404 iowait = kstat_cpu(i).cpustat.iowait;
405 irq = kstat_cpu(i).cpustat.irq;
406 softirq = kstat_cpu(i).cpustat.softirq;
407 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
409 (unsigned long long)jiffies_64_to_clock_t(user),
410 (unsigned long long)jiffies_64_to_clock_t(nice),
411 (unsigned long long)jiffies_64_to_clock_t(system),
412 (unsigned long long)jiffies_64_to_clock_t(idle),
413 (unsigned long long)jiffies_64_to_clock_t(iowait),
414 (unsigned long long)jiffies_64_to_clock_t(irq),
415 (unsigned long long)jiffies_64_to_clock_t(softirq));
417 seq_printf(p, "intr %llu", (unsigned long long)sum);
419 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
420 for (i = 0; i < NR_IRQS; i++)
421 seq_printf(p, " %u", kstat_irqs(i));
428 "procs_running %lu\n"
429 "procs_blocked %lu\n",
430 nr_context_switches(),
439 static int stat_open(struct inode *inode, struct file *file)
441 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
446 /* don't ask for more than the kmalloc() max size, currently 128 KB */
447 if (size > 128 * 1024)
449 buf = kmalloc(size, GFP_KERNEL);
453 res = single_open(file, show_stat, NULL);
455 m = file->private_data;
462 static struct file_operations proc_stat_operations = {
466 .release = single_release,
469 static int devices_read_proc(char *page, char **start, off_t off,
470 int count, int *eof, void *data)
472 int len = get_chrdev_list(page);
473 len += get_blkdev_list(page+len);
474 return proc_calc_metrics(page, start, off, count, eof, len);
480 static void *int_seq_start(struct seq_file *f, loff_t *pos)
482 return (*pos <= NR_IRQS) ? pos : NULL;
485 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
493 static void int_seq_stop(struct seq_file *f, void *v)
499 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
500 static struct seq_operations int_seq_ops = {
501 .start = int_seq_start,
502 .next = int_seq_next,
503 .stop = int_seq_stop,
504 .show = show_interrupts
507 int interrupts_open(struct inode *inode, struct file *filp)
509 return seq_open(filp, &int_seq_ops);
512 static struct file_operations proc_interrupts_operations = {
513 .open = interrupts_open,
516 .release = seq_release,
519 static int filesystems_read_proc(char *page, char **start, off_t off,
520 int count, int *eof, void *data)
522 int len = get_filesystem_list(page);
523 return proc_calc_metrics(page, start, off, count, eof, len);
526 static int cmdline_read_proc(char *page, char **start, off_t off,
527 int count, int *eof, void *data)
529 extern char saved_command_line[];
532 len = sprintf(page, "%s\n", saved_command_line);
533 return proc_calc_metrics(page, start, off, count, eof, len);
536 #ifdef CONFIG_SGI_DS1286
537 static int ds1286_read_proc(char *page, char **start, off_t off,
538 int count, int *eof, void *data)
540 int len = get_ds1286_status(page);
541 return proc_calc_metrics(page, start, off, count, eof, len);
545 static int locks_read_proc(char *page, char **start, off_t off,
546 int count, int *eof, void *data)
548 int len = get_locks_status(page, start, off, count);
555 static int execdomains_read_proc(char *page, char **start, off_t off,
556 int count, int *eof, void *data)
558 int len = get_exec_domain_list(page);
559 return proc_calc_metrics(page, start, off, count, eof, len);
563 * This function accesses profiling information. The returned data is
564 * binary: the sampling step and the actual contents of the profile
565 * buffer. Use of the program readprofile is recommended in order to
566 * get meaningful info out of these data.
569 read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
571 unsigned long p = *ppos;
574 unsigned int sample_step = 1 << prof_shift;
576 if (p >= (prof_len+1)*sizeof(unsigned int))
578 if (count > (prof_len+1)*sizeof(unsigned int) - p)
579 count = (prof_len+1)*sizeof(unsigned int) - p;
582 while (p < sizeof(unsigned int) && count > 0) {
583 put_user(*((char *)(&sample_step)+p),buf);
584 buf++; p++; count--; read++;
586 pnt = (char *)prof_buffer + p - sizeof(unsigned int);
587 if (copy_to_user(buf,(void *)pnt,count))
595 * Writing to /proc/profile resets the counters
597 * Writing a 'profiling multiplier' value into it also re-sets the profiling
598 * interrupt frequency, on architectures that support this.
600 static ssize_t write_profile(struct file *file, const char __user *buf,
601 size_t count, loff_t *ppos)
604 extern int setup_profiling_timer (unsigned int multiplier);
606 if (count == sizeof(int)) {
607 unsigned int multiplier;
609 if (copy_from_user(&multiplier, buf, sizeof(int)))
612 if (setup_profiling_timer(multiplier))
617 memset(prof_buffer, 0, prof_len * sizeof(*prof_buffer));
621 static struct file_operations proc_profile_operations = {
622 .read = read_profile,
623 .write = write_profile,
626 #ifdef CONFIG_MAGIC_SYSRQ
628 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
630 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
631 size_t count, loff_t *ppos)
636 if (get_user(c, buf))
638 handle_sysrq(c, NULL, NULL);
643 static struct file_operations proc_sysrq_trigger_operations = {
644 .write = write_sysrq_trigger,
648 struct proc_dir_entry *proc_root_kcore;
650 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
652 struct proc_dir_entry *entry;
653 entry = create_proc_entry(name, mode, NULL);
655 entry->proc_fops = f;
658 void __init proc_misc_init(void)
660 struct proc_dir_entry *entry;
663 int (*read_proc)(char*,char**,off_t,int,int*,void*);
664 } *p, simple_ones[] = {
665 {"loadavg", loadavg_read_proc},
666 {"uptime", uptime_read_proc},
667 {"meminfo", meminfo_read_proc},
668 {"version", version_read_proc},
669 #ifdef CONFIG_PROC_HARDWARE
670 {"hardware", hardware_read_proc},
672 #ifdef CONFIG_STRAM_PROC
673 {"stram", stram_read_proc},
675 {"devices", devices_read_proc},
676 {"filesystems", filesystems_read_proc},
677 {"cmdline", cmdline_read_proc},
678 #ifdef CONFIG_SGI_DS1286
679 {"rtc", ds1286_read_proc},
681 {"locks", locks_read_proc},
682 {"execdomains", execdomains_read_proc},
685 for (p = simple_ones; p->name; p++)
686 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
688 proc_symlink("mounts", NULL, "self/mounts");
690 /* And now for trickier ones */
691 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
693 entry->proc_fops = &proc_kmsg_operations;
694 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
695 create_seq_entry("partitions", 0, &proc_partitions_operations);
696 create_seq_entry("stat", 0, &proc_stat_operations);
697 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
698 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
699 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
700 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
701 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
702 #ifdef CONFIG_MODULES
703 create_seq_entry("modules", 0, &proc_modules_operations);
705 #ifdef CONFIG_PROC_KCORE
706 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
707 if (proc_root_kcore) {
708 proc_root_kcore->proc_fops = &proc_kcore_operations;
709 proc_root_kcore->size =
710 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
714 entry = create_proc_entry("profile", S_IWUSR | S_IRUGO, NULL);
716 entry->proc_fops = &proc_profile_operations;
717 entry->size = (1+prof_len) * sizeof(unsigned int);
720 #ifdef CONFIG_MAGIC_SYSRQ
721 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
723 entry->proc_fops = &proc_sysrq_trigger_operations;
727 extern struct file_operations ppc_htab_operations;
728 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
730 entry->proc_fops = &ppc_htab_operations;