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/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>
  29 #include <linux/mm.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 <asm/uaccess.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/io.h>
  50 #include <asm/tlb.h>
  51 #include <asm/div64.h>
  52 #include "internal.h"
  53
  54 #define LOAD_INT(x) ((x) >> FSHIFT)
  55 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  56 /*
  57  * Warning: stuff below (imported functions) assumes that its output will fit
  58  * into one page. For some of those functions it may be wrong. Moreover, we
  59  * have a way to deal with that gracefully. Right now I used straightforward
  60  * wrappers, but this needs further analysis wrt potential overflows.
  61  */
  62 extern int get_hardware_list(char *);
  63 extern int get_stram_list(char *);
  64 extern int get_chrdev_list(char *);
  65 extern int get_filesystem_list(char *);
  66 extern int get_exec_domain_list(char *);
  67 extern int get_dma_list(char *);
  68 extern int get_locks_status (char *, char **, off_t, int);
  69
  70 static int proc_calc_metrics(char *page, char **start, off_t off,
  71                                  int count, int *eof, int len)
  72 {
  73         if (len <= off+count) *eof = 1;
  74         *start = page + off;
  75         len -= off;
  76         if (len>count) len = count;
  77         if (len<0) len = 0;
  78         return len;
  79 }
  80
  81 static int loadavg_read_proc(char *page, char **start, off_t off,
  82                                  int count, int *eof, void *data)
  83 {
  84         int a, b, c;
  85         int len;
  86
  87         a = avenrun[0] + (FIXED_1/200);
  88         b = avenrun[1] + (FIXED_1/200);
  89         c = avenrun[2] + (FIXED_1/200);
  90         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  91                 LOAD_INT(a), LOAD_FRAC(a),
  92                 LOAD_INT(b), LOAD_FRAC(b),
  93                 LOAD_INT(c), LOAD_FRAC(c),
  94                 nr_running(), nr_threads, last_pid);
  95         return proc_calc_metrics(page, start, off, count, eof, len);
  96 }
  97
  98 static int uptime_read_proc(char *page, char **start, off_t off,
  99                                  int count, int *eof, void *data)
 100 {
 101         struct timespec uptime;
 102         struct timespec idle;
 103         int len;
 104         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 105
 106         do_posix_clock_monotonic_gettime(&uptime);
 107         cputime_to_timespec(idletime, &idle);
 108         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 109                         (unsigned long) uptime.tv_sec,
 110                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 111                         (unsigned long) idle.tv_sec,
 112                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 113
 114         return proc_calc_metrics(page, start, off, count, eof, len);
 115 }
 116
 117 static int meminfo_read_proc(char *page, char **start, off_t off,
 118                                  int count, int *eof, void *data)
 119 {
 120         struct sysinfo i;
 121         int len;
 122         struct page_state ps;
 123         unsigned long inactive;
 124         unsigned long active;
 125         unsigned long free;
 126         unsigned long committed;
 127         unsigned long allowed;
 128         struct vmalloc_info vmi;
 129
 130         get_page_state(&ps);
 131         get_zone_counts(&active, &inactive, &free);
 132
 133 /*
 134  * display in kilobytes.
 135  */
 136 #define K(x) ((x) << (PAGE_SHIFT - 10))
 137         si_meminfo(&i);
 138         si_swapinfo(&i);
 139         committed = atomic_read(&vm_committed_space);
 140         allowed = ((totalram_pages - hugetlb_total_pages())
 141                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 142
 143         get_vmalloc_info(&vmi);
 144
 145         /*
 146          * Tagged format, for easy grepping and expansion.
 147          */
 148         len = sprintf(page,
 149                 "MemTotal:     %8lu kB\n"
 150                 "MemFree:      %8lu kB\n"
 151                 "Buffers:      %8lu kB\n"
 152                 "Cached:       %8lu kB\n"
 153                 "SwapCached:   %8lu kB\n"
 154                 "Active:       %8lu kB\n"
 155                 "Inactive:     %8lu kB\n"
 156                 "HighTotal:    %8lu kB\n"
 157                 "HighFree:     %8lu kB\n"
 158                 "LowTotal:     %8lu kB\n"
 159                 "LowFree:      %8lu kB\n"
 160                 "SwapTotal:    %8lu kB\n"
 161                 "SwapFree:     %8lu kB\n"
 162                 "Dirty:        %8lu kB\n"
 163                 "Writeback:    %8lu kB\n"
 164                 "Mapped:       %8lu kB\n"
 165                 "Slab:         %8lu kB\n"
 166                 "CommitLimit:  %8lu kB\n"
 167                 "Committed_AS: %8lu kB\n"
 168                 "PageTables:   %8lu kB\n"
 169                 "VmallocTotal: %8lu kB\n"
 170                 "VmallocUsed:  %8lu kB\n"
 171                 "VmallocChunk: %8lu kB\n",
 172                 K(i.totalram),
 173                 K(i.freeram),
 174                 K(i.bufferram),
 175                 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
 176                 K(total_swapcache_pages),
 177                 K(active),
 178                 K(inactive),
 179                 K(i.totalhigh),
 180                 K(i.freehigh),
 181                 K(i.totalram-i.totalhigh),
 182                 K(i.freeram-i.freehigh),
 183                 K(i.totalswap),
 184                 K(i.freeswap),
 185                 K(ps.nr_dirty),
 186                 K(ps.nr_writeback),
 187                 K(ps.nr_mapped),
 188                 K(ps.nr_slab),
 189                 K(allowed),
 190                 K(committed),
 191                 K(ps.nr_page_table_pages),
 192                 VMALLOC_TOTAL >> 10,
 193                 vmi.used >> 10,
 194                 vmi.largest_chunk >> 10
 195                 );
 196
 197                 len += hugetlb_report_meminfo(page + len);
 198
 199         return proc_calc_metrics(page, start, off, count, eof, len);
 200 #undef K
 201 }
 202
 203 extern struct seq_operations fragmentation_op;
 204 static int fragmentation_open(struct inode *inode, struct file *file)
 205 {
 206         (void)inode;
 207         return seq_open(file, &fragmentation_op);
 208 }
 209
 210 static struct file_operations fragmentation_file_operations = {
 211         .open           = fragmentation_open,
 212         .read           = seq_read,
 213         .llseek         = seq_lseek,
 214         .release        = seq_release,
 215 };
 216
 217 static int version_read_proc(char *page, char **start, off_t off,
 218                                  int count, int *eof, void *data)
 219 {
 220         int len;
 221
 222         strcpy(page, linux_banner);
 223         len = strlen(page);
 224         return proc_calc_metrics(page, start, off, count, eof, len);
 225 }
 226
 227 extern struct seq_operations cpuinfo_op;
 228 static int cpuinfo_open(struct inode *inode, struct file *file)
 229 {
 230         return seq_open(file, &cpuinfo_op);
 231 }
 232 static struct file_operations proc_cpuinfo_operations = {
 233         .open           = cpuinfo_open,
 234         .read           = seq_read,
 235         .llseek         = seq_lseek,
 236         .release        = seq_release,
 237 };
 238
 239 extern struct seq_operations vmstat_op;
 240 static int vmstat_open(struct inode *inode, struct file *file)
 241 {
 242         return seq_open(file, &vmstat_op);
 243 }
 244 static struct file_operations proc_vmstat_file_operations = {
 245         .open           = vmstat_open,
 246         .read           = seq_read,
 247         .llseek         = seq_lseek,
 248         .release        = seq_release,
 249 };
 250
 251 #ifdef CONFIG_PROC_HARDWARE
 252 static int hardware_read_proc(char *page, char **start, off_t off,
 253                                  int count, int *eof, void *data)
 254 {
 255         int len = get_hardware_list(page);
 256         return proc_calc_metrics(page, start, off, count, eof, len);
 257 }
 258 #endif
 259
 260 #ifdef CONFIG_STRAM_PROC
 261 static int stram_read_proc(char *page, char **start, off_t off,
 262                                  int count, int *eof, void *data)
 263 {
 264         int len = get_stram_list(page);
 265         return proc_calc_metrics(page, start, off, count, eof, len);
 266 }
 267 #endif
 268
 269 extern struct seq_operations partitions_op;
 270 static int partitions_open(struct inode *inode, struct file *file)
 271 {
 272         return seq_open(file, &partitions_op);
 273 }
 274 static struct file_operations proc_partitions_operations = {
 275         .open           = partitions_open,
 276         .read           = seq_read,
 277         .llseek         = seq_lseek,
 278         .release        = seq_release,
 279 };
 280
 281 extern struct seq_operations diskstats_op;
 282 static int diskstats_open(struct inode *inode, struct file *file)
 283 {
 284         return seq_open(file, &diskstats_op);
 285 }
 286 static struct file_operations proc_diskstats_operations = {
 287         .open           = diskstats_open,
 288         .read           = seq_read,
 289         .llseek         = seq_lseek,
 290         .release        = seq_release,
 291 };
 292
 293 #ifdef CONFIG_MODULES
 294 extern struct seq_operations modules_op;
 295 static int modules_open(struct inode *inode, struct file *file)
 296 {
 297         return seq_open(file, &modules_op);
 298 }
 299 static struct file_operations proc_modules_operations = {
 300         .open           = modules_open,
 301         .read           = seq_read,
 302         .llseek         = seq_lseek,
 303         .release        = seq_release,
 304 };
 305 #endif
 306
 307 extern struct seq_operations slabinfo_op;
 308 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 309 static int slabinfo_open(struct inode *inode, struct file *file)
 310 {
 311         return seq_open(file, &slabinfo_op);
 312 }
 313 static struct file_operations proc_slabinfo_operations = {
 314         .open           = slabinfo_open,
 315         .read           = seq_read,
 316         .write          = slabinfo_write,
 317         .llseek         = seq_lseek,
 318         .release        = seq_release,
 319 };
 320
 321 static int show_stat(struct seq_file *p, void *v)
 322 {
 323         int i;
 324         unsigned long jif;
 325         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 326         u64 sum = 0;
 327
 328         user = nice = system = idle = iowait =
 329                 irq = softirq = steal = cputime64_zero;
 330         jif = - wall_to_monotonic.tv_sec;
 331         if (wall_to_monotonic.tv_nsec)
 332                 --jif;
 333
 334         for_each_cpu(i) {
 335                 int j;
 336
 337                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 338                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 339                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 340                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 341                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 342                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 343                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 344                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 345                 for (j = 0 ; j < NR_IRQS ; j++)
 346                         sum += kstat_cpu(i).irqs[j];
 347         }
 348
 349         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 350                 (unsigned long long)cputime64_to_clock_t(user),
 351                 (unsigned long long)cputime64_to_clock_t(nice),
 352                 (unsigned long long)cputime64_to_clock_t(system),
 353                 (unsigned long long)cputime64_to_clock_t(idle),
 354                 (unsigned long long)cputime64_to_clock_t(iowait),
 355                 (unsigned long long)cputime64_to_clock_t(irq),
 356                 (unsigned long long)cputime64_to_clock_t(softirq),
 357                 (unsigned long long)cputime64_to_clock_t(steal));
 358         for_each_online_cpu(i) {
 359
 360                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 361                 user = kstat_cpu(i).cpustat.user;
 362                 nice = kstat_cpu(i).cpustat.nice;
 363                 system = kstat_cpu(i).cpustat.system;
 364                 idle = kstat_cpu(i).cpustat.idle;
 365                 iowait = kstat_cpu(i).cpustat.iowait;
 366                 irq = kstat_cpu(i).cpustat.irq;
 367                 softirq = kstat_cpu(i).cpustat.softirq;
 368                 steal = kstat_cpu(i).cpustat.steal;
 369                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 370                         i,
 371                         (unsigned long long)cputime64_to_clock_t(user),
 372                         (unsigned long long)cputime64_to_clock_t(nice),
 373                         (unsigned long long)cputime64_to_clock_t(system),
 374                         (unsigned long long)cputime64_to_clock_t(idle),
 375                         (unsigned long long)cputime64_to_clock_t(iowait),
 376                         (unsigned long long)cputime64_to_clock_t(irq),
 377                         (unsigned long long)cputime64_to_clock_t(softirq),
 378                         (unsigned long long)cputime64_to_clock_t(steal));
 379         }
 380         seq_printf(p, "intr %llu", (unsigned long long)sum);
 381
 382 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
 383         for (i = 0; i < NR_IRQS; i++)
 384                 seq_printf(p, " %u", kstat_irqs(i));
 385 #endif
 386
 387         seq_printf(p,
 388                 "\nctxt %llu\n"
 389                 "btime %lu\n"
 390                 "processes %lu\n"
 391                 "procs_running %lu\n"
 392                 "procs_blocked %lu\n",
 393                 nr_context_switches(),
 394                 (unsigned long)jif,
 395                 total_forks,
 396                 nr_running(),
 397                 nr_iowait());
 398
 399         return 0;
 400 }
 401
 402 static int stat_open(struct inode *inode, struct file *file)
 403 {
 404         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 405         char *buf;
 406         struct seq_file *m;
 407         int res;
 408
 409         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 410         if (size > 128 * 1024)
 411                 size = 128 * 1024;
 412         buf = kmalloc(size, GFP_KERNEL);
 413         if (!buf)
 414                 return -ENOMEM;
 415
 416         res = single_open(file, show_stat, NULL);
 417         if (!res) {
 418                 m = file->private_data;
 419                 m->buf = buf;
 420                 m->size = size;
 421         } else
 422                 kfree(buf);
 423         return res;
 424 }
 425 static struct file_operations proc_stat_operations = {
 426         .open           = stat_open,
 427         .read           = seq_read,
 428         .llseek         = seq_lseek,
 429         .release        = single_release,
 430 };
 431
 432 static int devices_read_proc(char *page, char **start, off_t off,
 433                                  int count, int *eof, void *data)
 434 {
 435         int len = get_chrdev_list(page);
 436         len += get_blkdev_list(page+len);
 437         return proc_calc_metrics(page, start, off, count, eof, len);
 438 }
 439
 440 /*
 441  * /proc/interrupts
 442  */
 443 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 444 {
 445         return (*pos <= NR_IRQS) ? pos : NULL;
 446 }
 447
 448 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 449 {
 450         (*pos)++;
 451         if (*pos > NR_IRQS)
 452                 return NULL;
 453         return pos;
 454 }
 455
 456 static void int_seq_stop(struct seq_file *f, void *v)
 457 {
 458         /* Nothing to do */
 459 }
 460
 461
 462 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 463 static struct seq_operations int_seq_ops = {
 464         .start = int_seq_start,
 465         .next  = int_seq_next,
 466         .stop  = int_seq_stop,
 467         .show  = show_interrupts
 468 };
 469
 470 static int interrupts_open(struct inode *inode, struct file *filp)
 471 {
 472         return seq_open(filp, &int_seq_ops);
 473 }
 474
 475 static struct file_operations proc_interrupts_operations = {
 476         .open           = interrupts_open,
 477         .read           = seq_read,
 478         .llseek         = seq_lseek,
 479         .release        = seq_release,
 480 };
 481
 482 static int filesystems_read_proc(char *page, char **start, off_t off,
 483                                  int count, int *eof, void *data)
 484 {
 485         int len = get_filesystem_list(page);
 486         return proc_calc_metrics(page, start, off, count, eof, len);
 487 }
 488
 489 static int cmdline_read_proc(char *page, char **start, off_t off,
 490                                  int count, int *eof, void *data)
 491 {
 492         int len;
 493
 494         len = sprintf(page, "%s\n", saved_command_line);
 495         return proc_calc_metrics(page, start, off, count, eof, len);
 496 }
 497
 498 static int locks_read_proc(char *page, char **start, off_t off,
 499                                  int count, int *eof, void *data)
 500 {
 501         int len = get_locks_status(page, start, off, count);
 502
 503         if (len < count)
 504                 *eof = 1;
 505         return len;
 506 }
 507
 508 static int execdomains_read_proc(char *page, char **start, off_t off,
 509                                  int count, int *eof, void *data)
 510 {
 511         int len = get_exec_domain_list(page);
 512         return proc_calc_metrics(page, start, off, count, eof, len);
 513 }
 514
 515 #ifdef CONFIG_MAGIC_SYSRQ
 516 /*
 517  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 518  */
 519 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 520                                    size_t count, loff_t *ppos)
 521 {
 522         if (count) {
 523                 char c;
 524
 525                 if (get_user(c, buf))
 526                         return -EFAULT;
 527                 __handle_sysrq(c, NULL, NULL);
 528         }
 529         return count;
 530 }
 531
 532 static struct file_operations proc_sysrq_trigger_operations = {
 533         .write          = write_sysrq_trigger,
 534 };
 535 #endif
 536
 537 struct proc_dir_entry *proc_root_kcore;
 538
 539 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
 540 {
 541         struct proc_dir_entry *entry;
 542         entry = create_proc_entry(name, mode, NULL);
 543         if (entry)
 544                 entry->proc_fops = f;
 545 }
 546
 547 void __init proc_misc_init(void)
 548 {
 549         struct proc_dir_entry *entry;
 550         static struct {
 551                 char *name;
 552                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 553         } *p, simple_ones[] = {
 554                 {"loadavg",     loadavg_read_proc},
 555                 {"uptime",      uptime_read_proc},
 556                 {"meminfo",     meminfo_read_proc},
 557                 {"version",     version_read_proc},
 558 #ifdef CONFIG_PROC_HARDWARE
 559                 {"hardware",    hardware_read_proc},
 560 #endif
 561 #ifdef CONFIG_STRAM_PROC
 562                 {"stram",       stram_read_proc},
 563 #endif
 564                 {"devices",     devices_read_proc},
 565                 {"filesystems", filesystems_read_proc},
 566                 {"cmdline",     cmdline_read_proc},
 567                 {"locks",       locks_read_proc},
 568                 {"execdomains", execdomains_read_proc},
 569                 {NULL,}
 570         };
 571         for (p = simple_ones; p->name; p++)
 572                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 573
 574         proc_symlink("mounts", NULL, "self/mounts");
 575
 576         /* And now for trickier ones */
 577         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 578         if (entry)
 579                 entry->proc_fops = &proc_kmsg_operations;
 580         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 581         create_seq_entry("partitions", 0, &proc_partitions_operations);
 582         create_seq_entry("stat", 0, &proc_stat_operations);
 583         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 584         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 585         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 586         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 587         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 588 #ifdef CONFIG_MODULES
 589         create_seq_entry("modules", 0, &proc_modules_operations);
 590 #endif
 591 #ifdef CONFIG_SCHEDSTATS
 592         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 593 #endif
 594 #ifdef CONFIG_PROC_KCORE
 595         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 596         if (proc_root_kcore) {
 597                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 598                 proc_root_kcore->size =
 599                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 600         }
 601 #endif
 602 #ifdef CONFIG_MAGIC_SYSRQ
 603         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 604         if (entry)
 605                 entry->proc_fops = &proc_sysrq_trigger_operations;
 606 #endif
 607 #ifdef CONFIG_PPC32
 608         {
 609                 extern struct file_operations ppc_htab_operations;
 610                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
 611                 if (entry)
 612                         entry->proc_fops = &ppc_htab_operations;
 613         }
 614 #endif
 615 }