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/vs_base.h>
48 #include <linux/vs_cvirt.h>
50 #include <asm/uaccess.h>
51 #include <asm/pgtable.h>
54 #include <asm/div64.h>
56 #define LOAD_INT(x) ((x) >> FSHIFT)
57 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
59 * Warning: stuff below (imported functions) assumes that its output will fit
60 * into one page. For some of those functions it may be wrong. Moreover, we
61 * have a way to deal with that gracefully. Right now I used straightforward
62 * wrappers, but this needs further analysis wrt potential overflows.
64 extern int get_hardware_list(char *);
65 extern int get_stram_list(char *);
66 extern int get_chrdev_list(char *);
67 extern int get_blkdev_list(char *);
68 extern int get_filesystem_list(char *);
69 extern int get_exec_domain_list(char *);
70 extern int get_dma_list(char *);
71 extern int get_locks_status (char *, char **, off_t, int);
73 static int proc_calc_metrics(char *page, char **start, off_t off,
74 int count, int *eof, int len)
76 if (len <= off+count) *eof = 1;
79 if (len>count) len = count;
84 static int loadavg_read_proc(char *page, char **start, off_t off,
85 int count, int *eof, void *data)
90 a = avenrun[0] + (FIXED_1/200);
91 b = avenrun[1] + (FIXED_1/200);
92 c = avenrun[2] + (FIXED_1/200);
93 len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
94 LOAD_INT(a), LOAD_FRAC(a),
95 LOAD_INT(b), LOAD_FRAC(b),
96 LOAD_INT(c), LOAD_FRAC(c),
97 nr_running(), nr_threads, last_pid);
98 return proc_calc_metrics(page, start, off, count, eof, len);
101 struct vmalloc_info {
103 unsigned long largest_chunk;
106 static struct vmalloc_info get_vmalloc_info(void)
108 unsigned long prev_end = VMALLOC_START;
109 struct vm_struct* vma;
110 struct vmalloc_info vmi;
113 read_lock(&vmlist_lock);
116 vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
118 vmi.largest_chunk = 0;
120 for (vma = vmlist; vma; vma = vma->next) {
121 unsigned long free_area_size =
122 (unsigned long)vma->addr - prev_end;
123 vmi.used += vma->size;
124 if (vmi.largest_chunk < free_area_size )
126 vmi.largest_chunk = free_area_size;
127 prev_end = vma->size + (unsigned long)vma->addr;
129 if(VMALLOC_END-prev_end > vmi.largest_chunk)
130 vmi.largest_chunk = VMALLOC_END-prev_end;
132 read_unlock(&vmlist_lock);
136 static int uptime_read_proc(char *page, char **start, off_t off,
137 int count, int *eof, void *data)
139 struct timespec uptime;
140 struct timespec idle;
142 u64 idle_jiffies = init_task.utime + init_task.stime;
144 do_posix_clock_monotonic_gettime(&uptime);
145 jiffies_to_timespec(idle_jiffies, &idle);
146 if (vx_flags(VXF_VIRT_UPTIME, 0))
147 vx_vsi_uptime(&uptime, &idle);
149 len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
150 (unsigned long) uptime.tv_sec,
151 (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
152 (unsigned long) idle.tv_sec,
153 (idle.tv_nsec / (NSEC_PER_SEC / 100)));
155 return proc_calc_metrics(page, start, off, count, eof, len);
158 static int meminfo_read_proc(char *page, char **start, off_t off,
159 int count, int *eof, void *data)
163 struct page_state ps;
164 unsigned long inactive;
165 unsigned long active;
168 struct vmalloc_info vmi;
171 get_zone_counts(&active, &inactive, &free);
174 * display in kilobytes.
176 #define K(x) ((x) << (PAGE_SHIFT - 10))
179 committed = atomic_read(&vm_committed_space);
181 vmtot = (VMALLOC_END-VMALLOC_START)>>10;
182 vmi = get_vmalloc_info();
184 vmi.largest_chunk >>= 10;
187 * Tagged format, for easy grepping and expansion.
190 "MemTotal: %8lu kB\n"
194 "SwapCached: %8lu kB\n"
196 "Inactive: %8lu kB\n"
197 "HighTotal: %8lu kB\n"
198 "HighFree: %8lu kB\n"
199 "LowTotal: %8lu kB\n"
201 "SwapTotal: %8lu kB\n"
202 "SwapFree: %8lu kB\n"
204 "Writeback: %8lu kB\n"
207 "Committed_AS: %8u kB\n"
208 "PageTables: %8lu kB\n"
209 "VmallocTotal: %8lu kB\n"
210 "VmallocUsed: %8lu kB\n"
211 "VmallocChunk: %8lu kB\n",
215 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
216 K(total_swapcache_pages),
221 K(i.totalram-i.totalhigh),
222 K(i.freeram-i.freehigh),
230 K(ps.nr_page_table_pages),
236 len += hugetlb_report_meminfo(page + len);
238 return proc_calc_metrics(page, start, off, count, eof, len);
242 extern struct seq_operations fragmentation_op;
243 static int fragmentation_open(struct inode *inode, struct file *file)
246 return seq_open(file, &fragmentation_op);
249 static struct file_operations fragmentation_file_operations = {
250 .open = fragmentation_open,
253 .release = seq_release,
256 static int version_read_proc(char *page, char **start, off_t off,
257 int count, int *eof, void *data)
259 extern char *linux_banner;
262 strcpy(page, linux_banner);
264 return proc_calc_metrics(page, start, off, count, eof, len);
267 extern struct seq_operations cpuinfo_op;
268 static int cpuinfo_open(struct inode *inode, struct file *file)
270 return seq_open(file, &cpuinfo_op);
272 static struct file_operations proc_cpuinfo_operations = {
273 .open = cpuinfo_open,
276 .release = seq_release,
279 extern struct seq_operations vmstat_op;
280 static int vmstat_open(struct inode *inode, struct file *file)
282 return seq_open(file, &vmstat_op);
284 static struct file_operations proc_vmstat_file_operations = {
288 .release = seq_release,
291 #ifdef CONFIG_PROC_HARDWARE
292 static int hardware_read_proc(char *page, char **start, off_t off,
293 int count, int *eof, void *data)
295 int len = get_hardware_list(page);
296 return proc_calc_metrics(page, start, off, count, eof, len);
300 #ifdef CONFIG_STRAM_PROC
301 static int stram_read_proc(char *page, char **start, off_t off,
302 int count, int *eof, void *data)
304 int len = get_stram_list(page);
305 return proc_calc_metrics(page, start, off, count, eof, len);
309 extern struct seq_operations partitions_op;
310 static int partitions_open(struct inode *inode, struct file *file)
312 return seq_open(file, &partitions_op);
314 static struct file_operations proc_partitions_operations = {
315 .open = partitions_open,
318 .release = seq_release,
321 extern struct seq_operations diskstats_op;
322 static int diskstats_open(struct inode *inode, struct file *file)
324 return seq_open(file, &diskstats_op);
326 static struct file_operations proc_diskstats_operations = {
327 .open = diskstats_open,
330 .release = seq_release,
333 #ifdef CONFIG_MODULES
334 extern struct seq_operations modules_op;
335 static int modules_open(struct inode *inode, struct file *file)
337 return seq_open(file, &modules_op);
339 static struct file_operations proc_modules_operations = {
340 .open = modules_open,
343 .release = seq_release,
347 extern struct seq_operations slabinfo_op;
348 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
349 static int slabinfo_open(struct inode *inode, struct file *file)
351 return seq_open(file, &slabinfo_op);
353 static struct file_operations proc_slabinfo_operations = {
354 .open = slabinfo_open,
356 .write = slabinfo_write,
358 .release = seq_release,
361 int show_stat(struct seq_file *p, void *v)
364 extern unsigned long total_forks;
366 u64 sum = 0, user = 0, nice = 0, system = 0,
367 idle = 0, iowait = 0, irq = 0, softirq = 0;
369 jif = - wall_to_monotonic.tv_sec;
370 if (wall_to_monotonic.tv_nsec)
376 user += kstat_cpu(i).cpustat.user;
377 nice += kstat_cpu(i).cpustat.nice;
378 system += kstat_cpu(i).cpustat.system;
379 idle += kstat_cpu(i).cpustat.idle;
380 iowait += kstat_cpu(i).cpustat.iowait;
381 irq += kstat_cpu(i).cpustat.irq;
382 softirq += kstat_cpu(i).cpustat.softirq;
383 for (j = 0 ; j < NR_IRQS ; j++)
384 sum += kstat_cpu(i).irqs[j];
387 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu\n",
388 (unsigned long long)jiffies_64_to_clock_t(user),
389 (unsigned long long)jiffies_64_to_clock_t(nice),
390 (unsigned long long)jiffies_64_to_clock_t(system),
391 (unsigned long long)jiffies_64_to_clock_t(idle),
392 (unsigned long long)jiffies_64_to_clock_t(iowait),
393 (unsigned long long)jiffies_64_to_clock_t(irq),
394 (unsigned long long)jiffies_64_to_clock_t(softirq));
395 for_each_online_cpu(i) {
397 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
398 user = kstat_cpu(i).cpustat.user;
399 nice = kstat_cpu(i).cpustat.nice;
400 system = kstat_cpu(i).cpustat.system;
401 idle = kstat_cpu(i).cpustat.idle;
402 iowait = kstat_cpu(i).cpustat.iowait;
403 irq = kstat_cpu(i).cpustat.irq;
404 softirq = kstat_cpu(i).cpustat.softirq;
405 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
407 (unsigned long long)jiffies_64_to_clock_t(user),
408 (unsigned long long)jiffies_64_to_clock_t(nice),
409 (unsigned long long)jiffies_64_to_clock_t(system),
410 (unsigned long long)jiffies_64_to_clock_t(idle),
411 (unsigned long long)jiffies_64_to_clock_t(iowait),
412 (unsigned long long)jiffies_64_to_clock_t(irq),
413 (unsigned long long)jiffies_64_to_clock_t(softirq));
415 seq_printf(p, "intr %llu", (unsigned long long)sum);
417 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
418 for (i = 0; i < NR_IRQS; i++)
419 seq_printf(p, " %u", kstat_irqs(i));
426 "procs_running %lu\n"
427 "procs_blocked %lu\n"
429 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)
531 len = sprintf(page, "%s\n", saved_command_line);
532 return proc_calc_metrics(page, start, off, count, eof, len);
535 static int locks_read_proc(char *page, char **start, off_t off,
536 int count, int *eof, void *data)
538 int len = get_locks_status(page, start, off, count);
545 static int execdomains_read_proc(char *page, char **start, off_t off,
546 int count, int *eof, void *data)
548 int len = get_exec_domain_list(page);
549 return proc_calc_metrics(page, start, off, count, eof, len);
553 * This function accesses profiling information. The returned data is
554 * binary: the sampling step and the actual contents of the profile
555 * buffer. Use of the program readprofile is recommended in order to
556 * get meaningful info out of these data.
559 read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
561 unsigned long p = *ppos;
564 unsigned int sample_step = 1 << prof_shift;
566 if (p >= (prof_len+1)*sizeof(unsigned int))
568 if (count > (prof_len+1)*sizeof(unsigned int) - p)
569 count = (prof_len+1)*sizeof(unsigned int) - p;
572 while (p < sizeof(unsigned int) && count > 0) {
573 put_user(*((char *)(&sample_step)+p),buf);
574 buf++; p++; count--; read++;
576 pnt = (char *)prof_buffer + p - sizeof(unsigned int);
577 if (copy_to_user(buf,(void *)pnt,count))
585 * Writing to /proc/profile resets the counters
587 * Writing a 'profiling multiplier' value into it also re-sets the profiling
588 * interrupt frequency, on architectures that support this.
590 static ssize_t write_profile(struct file *file, const char __user *buf,
591 size_t count, loff_t *ppos)
594 extern int setup_profiling_timer (unsigned int multiplier);
596 if (count == sizeof(int)) {
597 unsigned int multiplier;
599 if (copy_from_user(&multiplier, buf, sizeof(int)))
602 if (setup_profiling_timer(multiplier))
607 memset(prof_buffer, 0, prof_len * sizeof(*prof_buffer));
611 static struct file_operations proc_profile_operations = {
612 .read = read_profile,
613 .write = write_profile,
616 #ifdef CONFIG_MAGIC_SYSRQ
618 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
620 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
621 size_t count, loff_t *ppos)
626 if (get_user(c, buf))
628 __handle_sysrq(c, NULL, NULL);
633 static struct file_operations proc_sysrq_trigger_operations = {
634 .write = write_sysrq_trigger,
638 struct proc_dir_entry *proc_root_kcore;
640 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
642 struct proc_dir_entry *entry;
643 entry = create_proc_entry(name, mode, NULL);
645 entry->proc_fops = f;
648 void __init proc_misc_init(void)
650 struct proc_dir_entry *entry;
653 int (*read_proc)(char*,char**,off_t,int,int*,void*);
654 } *p, simple_ones[] = {
655 {"loadavg", loadavg_read_proc},
656 {"uptime", uptime_read_proc},
657 {"meminfo", meminfo_read_proc},
658 {"version", version_read_proc},
659 #ifdef CONFIG_PROC_HARDWARE
660 {"hardware", hardware_read_proc},
662 #ifdef CONFIG_STRAM_PROC
663 {"stram", stram_read_proc},
665 {"devices", devices_read_proc},
666 {"filesystems", filesystems_read_proc},
667 {"cmdline", cmdline_read_proc},
668 {"locks", locks_read_proc},
669 {"execdomains", execdomains_read_proc},
672 for (p = simple_ones; p->name; p++)
673 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
675 proc_symlink("mounts", NULL, "self/mounts");
677 /* And now for trickier ones */
678 entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
680 entry->proc_fops = &proc_kmsg_operations;
681 create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
682 create_seq_entry("partitions", 0, &proc_partitions_operations);
683 create_seq_entry("stat", 0, &proc_stat_operations);
684 create_seq_entry("interrupts", 0, &proc_interrupts_operations);
685 create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
686 create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
687 create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
688 create_seq_entry("diskstats", 0, &proc_diskstats_operations);
689 #ifdef CONFIG_MODULES
690 create_seq_entry("modules", 0, &proc_modules_operations);
692 #ifdef CONFIG_PROC_KCORE
693 proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
694 if (proc_root_kcore) {
695 proc_root_kcore->proc_fops = &proc_kcore_operations;
696 proc_root_kcore->size =
697 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
701 entry = create_proc_entry("profile", S_IWUSR | S_IRUGO, NULL);
703 entry->proc_fops = &proc_profile_operations;
704 entry->size = (1+prof_len) * sizeof(unsigned int);
707 #ifdef CONFIG_MAGIC_SYSRQ
708 entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
710 entry->proc_fops = &proc_sysrq_trigger_operations;
714 extern struct file_operations ppc_htab_operations;
715 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
717 entry->proc_fops = &ppc_htab_operations;