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