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>
24 #include <linux/tty.h>
25 #include <linux/string.h>
26 #include <linux/mman.h>
27 #include <linux/quicklist.h>
28 #include <linux/proc_fs.h>
29 #include <linux/ioport.h>
31 #include <linux/mmzone.h>
32 #include <linux/pagemap.h>
33 #include <linux/irq.h>
34 #include <linux/interrupt.h>
35 #include <linux/swap.h>
36 #include <linux/slab.h>
37 #include <linux/genhd.h>
38 #include <linux/smp.h>
39 #include <linux/signal.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/seq_file.h>
43 #include <linux/times.h>
44 #include <linux/profile.h>
45 #include <linux/utsname.h>
46 #include <linux/blkdev.h>
47 #include <linux/hugetlb.h>
48 #include <linux/jiffies.h>
49 #include <linux/vmalloc.h>
50 #include <linux/crash_dump.h>
51 #include <linux/pid_namespace.h>
52 #include <linux/bootmem.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
57 #include <asm/div64.h>
61 * Warning: stuff below (imported functions) assumes that its output will fit
62 * into one page. For some of those functions it may be wrong. Moreover, we
63 * have a way to deal with that gracefully. Right now I used straightforward
64 * wrappers, but this needs further analysis wrt potential overflows.
67 static int proc_calc_metrics(char *page, char **start, off_t off,
68 int count, int *eof, int len)
70 if (len <= off+count) *eof = 1;
73 if (len>count) len = count;
78 static int fragmentation_open(struct inode *inode, struct file *file)
81 return seq_open(file, &fragmentation_op);
84 static const struct file_operations fragmentation_file_operations = {
85 .open = fragmentation_open,
88 .release = seq_release,
91 static int pagetypeinfo_open(struct inode *inode, struct file *file)
93 return seq_open(file, &pagetypeinfo_op);
96 static const struct file_operations pagetypeinfo_file_ops = {
97 .open = pagetypeinfo_open,
100 .release = seq_release,
103 static int zoneinfo_open(struct inode *inode, struct file *file)
105 return seq_open(file, &zoneinfo_op);
108 static const struct file_operations proc_zoneinfo_file_operations = {
109 .open = zoneinfo_open,
112 .release = seq_release,
115 extern const struct seq_operations cpuinfo_op;
116 static int cpuinfo_open(struct inode *inode, struct file *file)
118 return seq_open(file, &cpuinfo_op);
121 static const struct file_operations proc_cpuinfo_operations = {
122 .open = cpuinfo_open,
125 .release = seq_release,
128 static int devinfo_show(struct seq_file *f, void *v)
130 int i = *(loff_t *) v;
132 if (i < CHRDEV_MAJOR_HASH_SIZE) {
134 seq_printf(f, "Character devices:\n");
139 i -= CHRDEV_MAJOR_HASH_SIZE;
141 seq_printf(f, "\nBlock devices:\n");
148 static void *devinfo_start(struct seq_file *f, loff_t *pos)
150 if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
155 static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
158 if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
163 static void devinfo_stop(struct seq_file *f, void *v)
168 static const struct seq_operations devinfo_ops = {
169 .start = devinfo_start,
170 .next = devinfo_next,
171 .stop = devinfo_stop,
175 static int devinfo_open(struct inode *inode, struct file *filp)
177 return seq_open(filp, &devinfo_ops);
180 static const struct file_operations proc_devinfo_operations = {
181 .open = devinfo_open,
184 .release = seq_release,
187 static int vmstat_open(struct inode *inode, struct file *file)
189 return seq_open(file, &vmstat_op);
191 static const struct file_operations proc_vmstat_file_operations = {
195 .release = seq_release,
199 static int partitions_open(struct inode *inode, struct file *file)
201 return seq_open(file, &partitions_op);
203 static const struct file_operations proc_partitions_operations = {
204 .open = partitions_open,
207 .release = seq_release,
210 static int diskstats_open(struct inode *inode, struct file *file)
212 return seq_open(file, &diskstats_op);
214 static const struct file_operations proc_diskstats_operations = {
215 .open = diskstats_open,
218 .release = seq_release,
222 #ifdef CONFIG_MODULES
223 extern const struct seq_operations modules_op;
224 static int modules_open(struct inode *inode, struct file *file)
226 return seq_open(file, &modules_op);
228 static const struct file_operations proc_modules_operations = {
229 .open = modules_open,
232 .release = seq_release,
236 #ifdef CONFIG_SLABINFO
237 static int slabinfo_open(struct inode *inode, struct file *file)
239 return seq_open(file, &slabinfo_op);
241 static const struct file_operations proc_slabinfo_operations = {
242 .open = slabinfo_open,
244 .write = slabinfo_write,
246 .release = seq_release,
249 #ifdef CONFIG_DEBUG_SLAB_LEAK
250 extern const struct seq_operations slabstats_op;
251 static int slabstats_open(struct inode *inode, struct file *file)
253 unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
256 ret = seq_open(file, &slabstats_op);
258 struct seq_file *m = file->private_data;
259 *n = PAGE_SIZE / (2 * sizeof(unsigned long));
268 static const struct file_operations proc_slabstats_operations = {
269 .open = slabstats_open,
272 .release = seq_release_private,
278 static int vmalloc_open(struct inode *inode, struct file *file)
280 unsigned int *ptr = NULL;
284 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
285 ret = seq_open(file, &vmalloc_op);
287 struct seq_file *m = file->private_data;
294 static const struct file_operations proc_vmalloc_operations = {
295 .open = vmalloc_open,
298 .release = seq_release_private,
302 #ifndef arch_irq_stat_cpu
303 #define arch_irq_stat_cpu(cpu) 0
305 #ifndef arch_irq_stat
306 #define arch_irq_stat() 0
309 static int show_stat(struct seq_file *p, void *v)
313 cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
316 struct timespec boottime;
317 unsigned int per_irq_sum;
319 user = nice = system = idle = iowait =
320 irq = softirq = steal = cputime64_zero;
321 guest = cputime64_zero;
322 getboottime(&boottime);
323 jif = boottime.tv_sec;
325 for_each_possible_cpu(i) {
326 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
327 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
328 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
329 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
330 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
331 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
332 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
333 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
334 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
337 sum += kstat_irqs_cpu(j, i);
339 sum += arch_irq_stat_cpu(i);
341 sum += arch_irq_stat();
343 seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
344 (unsigned long long)cputime64_to_clock_t(user),
345 (unsigned long long)cputime64_to_clock_t(nice),
346 (unsigned long long)cputime64_to_clock_t(system),
347 (unsigned long long)cputime64_to_clock_t(idle),
348 (unsigned long long)cputime64_to_clock_t(iowait),
349 (unsigned long long)cputime64_to_clock_t(irq),
350 (unsigned long long)cputime64_to_clock_t(softirq),
351 (unsigned long long)cputime64_to_clock_t(steal),
352 (unsigned long long)cputime64_to_clock_t(guest));
353 for_each_online_cpu(i) {
355 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
356 user = kstat_cpu(i).cpustat.user;
357 nice = kstat_cpu(i).cpustat.nice;
358 system = kstat_cpu(i).cpustat.system;
359 idle = kstat_cpu(i).cpustat.idle;
360 iowait = kstat_cpu(i).cpustat.iowait;
361 irq = kstat_cpu(i).cpustat.irq;
362 softirq = kstat_cpu(i).cpustat.softirq;
363 steal = kstat_cpu(i).cpustat.steal;
364 guest = kstat_cpu(i).cpustat.guest;
366 "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
368 (unsigned long long)cputime64_to_clock_t(user),
369 (unsigned long long)cputime64_to_clock_t(nice),
370 (unsigned long long)cputime64_to_clock_t(system),
371 (unsigned long long)cputime64_to_clock_t(idle),
372 (unsigned long long)cputime64_to_clock_t(iowait),
373 (unsigned long long)cputime64_to_clock_t(irq),
374 (unsigned long long)cputime64_to_clock_t(softirq),
375 (unsigned long long)cputime64_to_clock_t(steal),
376 (unsigned long long)cputime64_to_clock_t(guest));
378 seq_printf(p, "intr %llu", (unsigned long long)sum);
380 /* sum again ? it could be updated? */
384 for_each_possible_cpu(i)
385 per_irq_sum += kstat_irqs_cpu(j, i);
387 seq_printf(p, " %u", per_irq_sum);
394 "procs_running %lu\n"
395 "procs_blocked %lu\n",
396 nr_context_switches(),
405 static int stat_open(struct inode *inode, struct file *file)
407 unsigned size = 4096 * (1 + num_possible_cpus() / 32);
412 /* don't ask for more than the kmalloc() max size, currently 128 KB */
413 if (size > 128 * 1024)
415 buf = kmalloc(size, GFP_KERNEL);
419 res = single_open(file, show_stat, NULL);
421 m = file->private_data;
428 static const struct file_operations proc_stat_operations = {
432 .release = single_release,
438 static void *int_seq_start(struct seq_file *f, loff_t *pos)
440 return (*pos <= nr_irqs) ? pos : NULL;
444 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
447 return (*pos <= nr_irqs) ? pos : NULL;
450 static void int_seq_stop(struct seq_file *f, void *v)
455 static const struct seq_operations int_seq_ops = {
456 .start = int_seq_start,
457 .next = int_seq_next,
458 .stop = int_seq_stop,
459 .show = show_interrupts
462 static int interrupts_open(struct inode *inode, struct file *filp)
464 return seq_open(filp, &int_seq_ops);
467 static const struct file_operations proc_interrupts_operations = {
468 .open = interrupts_open,
471 .release = seq_release,
474 #ifdef CONFIG_FILE_LOCKING
475 static int locks_open(struct inode *inode, struct file *filp)
477 return seq_open(filp, &locks_seq_operations);
480 static const struct file_operations proc_locks_operations = {
484 .release = seq_release,
486 #endif /* CONFIG_FILE_LOCKING */
488 #ifdef CONFIG_PROC_PAGE_MONITOR
489 #define KPMSIZE sizeof(u64)
490 #define KPMMASK (KPMSIZE - 1)
491 /* /proc/kpagecount - an array exposing page counts
493 * Each entry is a u64 representing the corresponding
494 * physical page count.
496 static ssize_t kpagecount_read(struct file *file, char __user *buf,
497 size_t count, loff_t *ppos)
499 u64 __user *out = (u64 __user *)buf;
501 unsigned long src = *ppos;
507 count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
508 if (src & KPMMASK || count & KPMMASK)
514 ppage = pfn_to_page(pfn);
519 pcount = page_mapcount(ppage);
521 if (put_user(pcount, out++)) {
529 *ppos += (char __user *)out - buf;
531 ret = (char __user *)out - buf;
535 static struct file_operations proc_kpagecount_operations = {
537 .read = kpagecount_read,
540 /* /proc/kpageflags - an array exposing page flags
542 * Each entry is a u64 representing the corresponding
543 * physical page flags.
546 /* These macros are used to decouple internal flags from exported ones */
550 #define KPF_REFERENCED 2
551 #define KPF_UPTODATE 3
556 #define KPF_WRITEBACK 8
557 #define KPF_RECLAIM 9
560 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
562 static ssize_t kpageflags_read(struct file *file, char __user *buf,
563 size_t count, loff_t *ppos)
565 u64 __user *out = (u64 __user *)buf;
567 unsigned long src = *ppos;
573 count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
574 if (src & KPMMASK || count & KPMMASK)
580 ppage = pfn_to_page(pfn);
585 kflags = ppage->flags;
587 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
588 kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
589 kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
590 kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
591 kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
592 kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
593 kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
594 kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
595 kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
596 kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
597 kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
599 if (put_user(uflags, out++)) {
607 *ppos += (char __user *)out - buf;
609 ret = (char __user *)out - buf;
613 static struct file_operations proc_kpageflags_operations = {
615 .read = kpageflags_read,
617 #endif /* CONFIG_PROC_PAGE_MONITOR */
619 struct proc_dir_entry *proc_root_kcore;
621 void __init proc_misc_init(void)
625 int (*read_proc)(char*,char**,off_t,int,int*,void*);
626 } *p, simple_ones[] = {
629 for (p = simple_ones; p->name; p++)
630 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
632 proc_symlink("mounts", NULL, "self/mounts");
634 /* And now for trickier ones */
636 proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
638 #ifdef CONFIG_FILE_LOCKING
639 proc_create("locks", 0, NULL, &proc_locks_operations);
641 proc_create("devices", 0, NULL, &proc_devinfo_operations);
642 proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
644 proc_create("partitions", 0, NULL, &proc_partitions_operations);
646 proc_create("stat", 0, NULL, &proc_stat_operations);
647 proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
648 #ifdef CONFIG_SLABINFO
649 proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
650 #ifdef CONFIG_DEBUG_SLAB_LEAK
651 proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
655 proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
657 proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
658 proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
659 proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
660 proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
662 proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
664 #ifdef CONFIG_MODULES
665 proc_create("modules", 0, NULL, &proc_modules_operations);
667 #ifdef CONFIG_SCHEDSTATS
668 proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
670 #ifdef CONFIG_PROC_KCORE
671 proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
673 proc_root_kcore->size =
674 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
676 #ifdef CONFIG_PROC_PAGE_MONITOR
677 proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
678 proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
680 #ifdef CONFIG_PROC_VMCORE
681 proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);