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