fs/proc/proc_misc.c

   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/fs.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>
  30 #include <linux/mm.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>
  55 #include <asm/io.h>
  56 #include <asm/tlb.h>
  57 #include <asm/div64.h>
  58 #include "internal.h"
  59
  60 static int fragmentation_open(struct inode *inode, struct file *file)
  61 {
  62         (void)inode;
  63         return seq_open(file, &fragmentation_op);
  64 }
  65
  66 static const struct file_operations fragmentation_file_operations = {
  67         .open           = fragmentation_open,
  68         .read           = seq_read,
  69         .llseek         = seq_lseek,
  70         .release        = seq_release,
  71 };
  72
  73 static int pagetypeinfo_open(struct inode *inode, struct file *file)
  74 {
  75         return seq_open(file, &pagetypeinfo_op);
  76 }
  77
  78 static const struct file_operations pagetypeinfo_file_ops = {
  79         .open           = pagetypeinfo_open,
  80         .read           = seq_read,
  81         .llseek         = seq_lseek,
  82         .release        = seq_release,
  83 };
  84
  85 static int zoneinfo_open(struct inode *inode, struct file *file)
  86 {
  87         return seq_open(file, &zoneinfo_op);
  88 }
  89
  90 static const struct file_operations proc_zoneinfo_file_operations = {
  91         .open           = zoneinfo_open,
  92         .read           = seq_read,
  93         .llseek         = seq_lseek,
  94         .release        = seq_release,
  95 };
  96
  97 extern const struct seq_operations cpuinfo_op;
  98 static int cpuinfo_open(struct inode *inode, struct file *file)
  99 {
 100         return seq_open(file, &cpuinfo_op);
 101 }
 102
 103 static const struct file_operations proc_cpuinfo_operations = {
 104         .open           = cpuinfo_open,
 105         .read           = seq_read,
 106         .llseek         = seq_lseek,
 107         .release        = seq_release,
 108 };
 109
 110 static int vmstat_open(struct inode *inode, struct file *file)
 111 {
 112         return seq_open(file, &vmstat_op);
 113 }
 114 static const struct file_operations proc_vmstat_file_operations = {
 115         .open           = vmstat_open,
 116         .read           = seq_read,
 117         .llseek         = seq_lseek,
 118         .release        = seq_release,
 119 };
 120
 121 #ifdef CONFIG_BLOCK
 122 static int partitions_open(struct inode *inode, struct file *file)
 123 {
 124         return seq_open(file, &partitions_op);
 125 }
 126 static const struct file_operations proc_partitions_operations = {
 127         .open           = partitions_open,
 128         .read           = seq_read,
 129         .llseek         = seq_lseek,
 130         .release        = seq_release,
 131 };
 132
 133 static int diskstats_open(struct inode *inode, struct file *file)
 134 {
 135         return seq_open(file, &diskstats_op);
 136 }
 137 static const struct file_operations proc_diskstats_operations = {
 138         .open           = diskstats_open,
 139         .read           = seq_read,
 140         .llseek         = seq_lseek,
 141         .release        = seq_release,
 142 };
 143 #endif
 144
 145 #ifdef CONFIG_MODULES
 146 extern const struct seq_operations modules_op;
 147 static int modules_open(struct inode *inode, struct file *file)
 148 {
 149         return seq_open(file, &modules_op);
 150 }
 151 static const struct file_operations proc_modules_operations = {
 152         .open           = modules_open,
 153         .read           = seq_read,
 154         .llseek         = seq_lseek,
 155         .release        = seq_release,
 156 };
 157 #endif
 158
 159 #ifdef CONFIG_SLABINFO
 160 static int slabinfo_open(struct inode *inode, struct file *file)
 161 {
 162         return seq_open(file, &slabinfo_op);
 163 }
 164 static const struct file_operations proc_slabinfo_operations = {
 165         .open           = slabinfo_open,
 166         .read           = seq_read,
 167         .write          = slabinfo_write,
 168         .llseek         = seq_lseek,
 169         .release        = seq_release,
 170 };
 171
 172 #ifdef CONFIG_DEBUG_SLAB_LEAK
 173 extern const struct seq_operations slabstats_op;
 174 static int slabstats_open(struct inode *inode, struct file *file)
 175 {
 176         unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
 177         int ret = -ENOMEM;
 178         if (n) {
 179                 ret = seq_open(file, &slabstats_op);
 180                 if (!ret) {
 181                         struct seq_file *m = file->private_data;
 182                         *n = PAGE_SIZE / (2 * sizeof(unsigned long));
 183                         m->private = n;
 184                         n = NULL;
 185                 }
 186                 kfree(n);
 187         }
 188         return ret;
 189 }
 190
 191 static const struct file_operations proc_slabstats_operations = {
 192         .open           = slabstats_open,
 193         .read           = seq_read,
 194         .llseek         = seq_lseek,
 195         .release        = seq_release_private,
 196 };
 197 #endif
 198 #endif
 199
 200 #ifdef CONFIG_MMU
 201 static int vmalloc_open(struct inode *inode, struct file *file)
 202 {
 203         unsigned int *ptr = NULL;
 204         int ret;
 205
 206         if (NUMA_BUILD)
 207                 ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
 208         ret = seq_open(file, &vmalloc_op);
 209         if (!ret) {
 210                 struct seq_file *m = file->private_data;
 211                 m->private = ptr;
 212         } else
 213                 kfree(ptr);
 214         return ret;
 215 }
 216
 217 static const struct file_operations proc_vmalloc_operations = {
 218         .open           = vmalloc_open,
 219         .read           = seq_read,
 220         .llseek         = seq_lseek,
 221         .release        = seq_release_private,
 222 };
 223 #endif
 224
 225 #ifndef arch_irq_stat_cpu
 226 #define arch_irq_stat_cpu(cpu) 0
 227 #endif
 228 #ifndef arch_irq_stat
 229 #define arch_irq_stat() 0
 230 #endif
 231
 232 static int show_stat(struct seq_file *p, void *v)
 233 {
 234         int i, j;
 235         unsigned long jif;
 236         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 237         cputime64_t guest;
 238         u64 sum = 0;
 239         struct timespec boottime;
 240         unsigned int per_irq_sum;
 241
 242         user = nice = system = idle = iowait =
 243                 irq = softirq = steal = cputime64_zero;
 244         guest = cputime64_zero;
 245         getboottime(&boottime);
 246         jif = boottime.tv_sec;
 247
 248         for_each_possible_cpu(i) {
 249                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 250                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 251                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 252                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 253                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 254                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 255                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 256                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 257                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
 258
 259                 for_each_irq_nr(j)
 260                         sum += kstat_irqs_cpu(j, i);
 261
 262                 sum += arch_irq_stat_cpu(i);
 263         }
 264         sum += arch_irq_stat();
 265
 266         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 267                 (unsigned long long)cputime64_to_clock_t(user),
 268                 (unsigned long long)cputime64_to_clock_t(nice),
 269                 (unsigned long long)cputime64_to_clock_t(system),
 270                 (unsigned long long)cputime64_to_clock_t(idle),
 271                 (unsigned long long)cputime64_to_clock_t(iowait),
 272                 (unsigned long long)cputime64_to_clock_t(irq),
 273                 (unsigned long long)cputime64_to_clock_t(softirq),
 274                 (unsigned long long)cputime64_to_clock_t(steal),
 275                 (unsigned long long)cputime64_to_clock_t(guest));
 276         for_each_online_cpu(i) {
 277
 278                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 279                 user = kstat_cpu(i).cpustat.user;
 280                 nice = kstat_cpu(i).cpustat.nice;
 281                 system = kstat_cpu(i).cpustat.system;
 282                 idle = kstat_cpu(i).cpustat.idle;
 283                 iowait = kstat_cpu(i).cpustat.iowait;
 284                 irq = kstat_cpu(i).cpustat.irq;
 285                 softirq = kstat_cpu(i).cpustat.softirq;
 286                 steal = kstat_cpu(i).cpustat.steal;
 287                 guest = kstat_cpu(i).cpustat.guest;
 288                 seq_printf(p,
 289                         "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 290                         i,
 291                         (unsigned long long)cputime64_to_clock_t(user),
 292                         (unsigned long long)cputime64_to_clock_t(nice),
 293                         (unsigned long long)cputime64_to_clock_t(system),
 294                         (unsigned long long)cputime64_to_clock_t(idle),
 295                         (unsigned long long)cputime64_to_clock_t(iowait),
 296                         (unsigned long long)cputime64_to_clock_t(irq),
 297                         (unsigned long long)cputime64_to_clock_t(softirq),
 298                         (unsigned long long)cputime64_to_clock_t(steal),
 299                         (unsigned long long)cputime64_to_clock_t(guest));
 300         }
 301         seq_printf(p, "intr %llu", (unsigned long long)sum);
 302
 303         /* sum again ? it could be updated? */
 304         for_each_irq_nr(j) {
 305                 per_irq_sum = 0;
 306
 307                 for_each_possible_cpu(i)
 308                         per_irq_sum += kstat_irqs_cpu(j, i);
 309
 310                 seq_printf(p, " %u", per_irq_sum);
 311         }
 312
 313         seq_printf(p,
 314                 "\nctxt %llu\n"
 315                 "btime %lu\n"
 316                 "processes %lu\n"
 317                 "procs_running %lu\n"
 318                 "procs_blocked %lu\n",
 319                 nr_context_switches(),
 320                 (unsigned long)jif,
 321                 total_forks,
 322                 nr_running(),
 323                 nr_iowait());
 324
 325         return 0;
 326 }
 327
 328 static int stat_open(struct inode *inode, struct file *file)
 329 {
 330         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 331         char *buf;
 332         struct seq_file *m;
 333         int res;
 334
 335         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 336         if (size > 128 * 1024)
 337                 size = 128 * 1024;
 338         buf = kmalloc(size, GFP_KERNEL);
 339         if (!buf)
 340                 return -ENOMEM;
 341
 342         res = single_open(file, show_stat, NULL);
 343         if (!res) {
 344                 m = file->private_data;
 345                 m->buf = buf;
 346                 m->size = size;
 347         } else
 348                 kfree(buf);
 349         return res;
 350 }
 351 static const struct file_operations proc_stat_operations = {
 352         .open           = stat_open,
 353         .read           = seq_read,
 354         .llseek         = seq_lseek,
 355         .release        = single_release,
 356 };
 357
 358 /*
 359  * /proc/interrupts
 360  */
 361 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 362 {
 363         return (*pos <= nr_irqs) ? pos : NULL;
 364 }
 365
 366
 367 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 368 {
 369         (*pos)++;
 370         return (*pos <= nr_irqs) ? pos : NULL;
 371 }
 372
 373 static void int_seq_stop(struct seq_file *f, void *v)
 374 {
 375         /* Nothing to do */
 376 }
 377
 378 static const struct seq_operations int_seq_ops = {
 379         .start = int_seq_start,
 380         .next  = int_seq_next,
 381         .stop  = int_seq_stop,
 382         .show  = show_interrupts
 383 };
 384
 385 static int interrupts_open(struct inode *inode, struct file *filp)
 386 {
 387         return seq_open(filp, &int_seq_ops);
 388 }
 389
 390 static const struct file_operations proc_interrupts_operations = {
 391         .open           = interrupts_open,
 392         .read           = seq_read,
 393         .llseek         = seq_lseek,
 394         .release        = seq_release,
 395 };
 396
 397 #ifdef CONFIG_PROC_PAGE_MONITOR
 398 #define KPMSIZE sizeof(u64)
 399 #define KPMMASK (KPMSIZE - 1)
 400 /* /proc/kpagecount - an array exposing page counts
 401  *
 402  * Each entry is a u64 representing the corresponding
 403  * physical page count.
 404  */
 405 static ssize_t kpagecount_read(struct file *file, char __user *buf,
 406                              size_t count, loff_t *ppos)
 407 {
 408         u64 __user *out = (u64 __user *)buf;
 409         struct page *ppage;
 410         unsigned long src = *ppos;
 411         unsigned long pfn;
 412         ssize_t ret = 0;
 413         u64 pcount;
 414
 415         pfn = src / KPMSIZE;
 416         count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
 417         if (src & KPMMASK || count & KPMMASK)
 418                 return -EINVAL;
 419
 420         while (count > 0) {
 421                 ppage = NULL;
 422                 if (pfn_valid(pfn))
 423                         ppage = pfn_to_page(pfn);
 424                 pfn++;
 425                 if (!ppage)
 426                         pcount = 0;
 427                 else
 428                         pcount = page_mapcount(ppage);
 429
 430                 if (put_user(pcount, out++)) {
 431                         ret = -EFAULT;
 432                         break;
 433                 }
 434
 435                 count -= KPMSIZE;
 436         }
 437
 438         *ppos += (char __user *)out - buf;
 439         if (!ret)
 440                 ret = (char __user *)out - buf;
 441         return ret;
 442 }
 443
 444 static struct file_operations proc_kpagecount_operations = {
 445         .llseek = mem_lseek,
 446         .read = kpagecount_read,
 447 };
 448
 449 /* /proc/kpageflags - an array exposing page flags
 450  *
 451  * Each entry is a u64 representing the corresponding
 452  * physical page flags.
 453  */
 454
 455 /* These macros are used to decouple internal flags from exported ones */
 456
 457 #define KPF_LOCKED     0
 458 #define KPF_ERROR      1
 459 #define KPF_REFERENCED 2
 460 #define KPF_UPTODATE   3
 461 #define KPF_DIRTY      4
 462 #define KPF_LRU        5
 463 #define KPF_ACTIVE     6
 464 #define KPF_SLAB       7
 465 #define KPF_WRITEBACK  8
 466 #define KPF_RECLAIM    9
 467 #define KPF_BUDDY     10
 468
 469 #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos)
 470
 471 static ssize_t kpageflags_read(struct file *file, char __user *buf,
 472                              size_t count, loff_t *ppos)
 473 {
 474         u64 __user *out = (u64 __user *)buf;
 475         struct page *ppage;
 476         unsigned long src = *ppos;
 477         unsigned long pfn;
 478         ssize_t ret = 0;
 479         u64 kflags, uflags;
 480
 481         pfn = src / KPMSIZE;
 482         count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
 483         if (src & KPMMASK || count & KPMMASK)
 484                 return -EINVAL;
 485
 486         while (count > 0) {
 487                 ppage = NULL;
 488                 if (pfn_valid(pfn))
 489                         ppage = pfn_to_page(pfn);
 490                 pfn++;
 491                 if (!ppage)
 492                         kflags = 0;
 493                 else
 494                         kflags = ppage->flags;
 495
 496                 uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) |
 497                         kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
 498                         kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
 499                         kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
 500                         kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
 501                         kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
 502                         kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
 503                         kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
 504                         kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 505                         kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 506                         kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
 507
 508                 if (put_user(uflags, out++)) {
 509                         ret = -EFAULT;
 510                         break;
 511                 }
 512
 513                 count -= KPMSIZE;
 514         }
 515
 516         *ppos += (char __user *)out - buf;
 517         if (!ret)
 518                 ret = (char __user *)out - buf;
 519         return ret;
 520 }
 521
 522 static struct file_operations proc_kpageflags_operations = {
 523         .llseek = mem_lseek,
 524         .read = kpageflags_read,
 525 };
 526 #endif /* CONFIG_PROC_PAGE_MONITOR */
 527
 528 struct proc_dir_entry *proc_root_kcore;
 529
 530 void __init proc_misc_init(void)
 531 {
 532         proc_symlink("mounts", NULL, "self/mounts");
 533
 534         /* And now for trickier ones */
 535         proc_create("cpuinfo", 0, NULL, &proc_cpuinfo_operations);
 536 #ifdef CONFIG_BLOCK
 537         proc_create("partitions", 0, NULL, &proc_partitions_operations);
 538 #endif
 539         proc_create("stat", 0, NULL, &proc_stat_operations);
 540         proc_create("interrupts", 0, NULL, &proc_interrupts_operations);
 541 #ifdef CONFIG_SLABINFO
 542         proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
 543 #ifdef CONFIG_DEBUG_SLAB_LEAK
 544         proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
 545 #endif
 546 #endif
 547 #ifdef CONFIG_MMU
 548         proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
 549 #endif
 550         proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
 551         proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
 552         proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
 553         proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
 554 #ifdef CONFIG_BLOCK
 555         proc_create("diskstats", 0, NULL, &proc_diskstats_operations);
 556 #endif
 557 #ifdef CONFIG_MODULES
 558         proc_create("modules", 0, NULL, &proc_modules_operations);
 559 #endif
 560 #ifdef CONFIG_SCHEDSTATS
 561         proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
 562 #endif
 563 #ifdef CONFIG_PROC_KCORE
 564         proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
 565         if (proc_root_kcore)
 566                 proc_root_kcore->size =
 567                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 568 #endif
 569 #ifdef CONFIG_PROC_PAGE_MONITOR
 570         proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
 571         proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
 572 #endif
 573 #ifdef CONFIG_PROC_VMCORE
 574         proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
 575 #endif
 576 }