drivers/s390/block/dasd_proc.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Coypright IBM Corp. 1999, 2002
   8  *
   9  * /proc interface for the dasd driver.
  10  *
  11  */
  12
  13 #define KMSG_COMPONENT "dasd"
  14
  15 #include <linux/ctype.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/proc_fs.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/uaccess.h>
  24
  25 /* This is ugly... */
  26 #define PRINTK_HEADER "dasd_proc:"
  27
  28 #include "dasd_int.h"
  29
  30 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
  31 static struct proc_dir_entry *dasd_devices_entry = NULL;
  32 static struct proc_dir_entry *dasd_statistics_entry = NULL;
  33
  34 static int
  35 dasd_devices_show(struct seq_file *m, void *v)
  36 {
  37         struct dasd_device *device;
  38         struct dasd_block *block;
  39         char *substr;
  40
  41         device = dasd_device_from_devindex((unsigned long) v - 1);
  42         if (IS_ERR(device))
  43                 return 0;
  44         if (device->block)
  45                 block = device->block;
  46         else {
  47                 dasd_put_device(device);
  48                 return 0;
  49         }
  50         /* Print device number. */
  51         seq_printf(m, "%s", dev_name(&device->cdev->dev));
  52         /* Print discipline string. */
  53         if (device->discipline != NULL)
  54                 seq_printf(m, "(%s)", device->discipline->name);
  55         else
  56                 seq_printf(m, "(none)");
  57         /* Print kdev. */
  58         if (block->gdp)
  59                 seq_printf(m, " at (%3d:%6d)",
  60                            MAJOR(disk_devt(block->gdp)),
  61                            MINOR(disk_devt(block->gdp)));
  62         else
  63                 seq_printf(m, "  at (???:??????)");
  64         /* Print device name. */
  65         if (block->gdp)
  66                 seq_printf(m, " is %-8s", block->gdp->disk_name);
  67         else
  68                 seq_printf(m, " is ????????");
  69         /* Print devices features. */
  70         substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
  71         seq_printf(m, "%4s: ", substr);
  72         /* Print device status information. */
  73         switch (device->state) {
  74         case DASD_STATE_NEW:
  75                 seq_printf(m, "new");
  76                 break;
  77         case DASD_STATE_KNOWN:
  78                 seq_printf(m, "detected");
  79                 break;
  80         case DASD_STATE_BASIC:
  81                 seq_printf(m, "basic");
  82                 break;
  83         case DASD_STATE_UNFMT:
  84                 seq_printf(m, "unformatted");
  85                 break;
  86         case DASD_STATE_READY:
  87         case DASD_STATE_ONLINE:
  88                 seq_printf(m, "active ");
  89                 if (dasd_check_blocksize(block->bp_block))
  90                         seq_printf(m, "n/f       ");
  91                 else
  92                         seq_printf(m,
  93                                    "at blocksize: %d, %lld blocks, %lld MB",
  94                                    block->bp_block, block->blocks,
  95                                    ((block->bp_block >> 9) *
  96                                     block->blocks) >> 11);
  97                 break;
  98         default:
  99                 seq_printf(m, "no stat");
 100                 break;
 101         }
 102         dasd_put_device(device);
 103         if (dasd_probeonly)
 104                 seq_printf(m, "(probeonly)");
 105         seq_printf(m, "\n");
 106         return 0;
 107 }
 108
 109 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 110 {
 111         if (*pos >= dasd_max_devindex)
 112                 return NULL;
 113         return (void *)((unsigned long) *pos + 1);
 114 }
 115
 116 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 117 {
 118         ++*pos;
 119         return dasd_devices_start(m, pos);
 120 }
 121
 122 static void dasd_devices_stop(struct seq_file *m, void *v)
 123 {
 124 }
 125
 126 static const struct seq_operations dasd_devices_seq_ops = {
 127         .start          = dasd_devices_start,
 128         .next           = dasd_devices_next,
 129         .stop           = dasd_devices_stop,
 130         .show           = dasd_devices_show,
 131 };
 132
 133 static int dasd_devices_open(struct inode *inode, struct file *file)
 134 {
 135         return seq_open(file, &dasd_devices_seq_ops);
 136 }
 137
 138 static const struct file_operations dasd_devices_file_ops = {
 139         .owner          = THIS_MODULE,
 140         .open           = dasd_devices_open,
 141         .read           = seq_read,
 142         .llseek         = seq_lseek,
 143         .release        = seq_release,
 144 };
 145
 146 #ifdef CONFIG_DASD_PROFILE
 147 static int dasd_stats_all_block_on(void)
 148 {
 149         int i, rc;
 150         struct dasd_device *device;
 151
 152         rc = 0;
 153         for (i = 0; i < dasd_max_devindex; ++i) {
 154                 device = dasd_device_from_devindex(i);
 155                 if (IS_ERR(device))
 156                         continue;
 157                 if (device->block)
 158                         rc = dasd_profile_on(&device->block->profile);
 159                 dasd_put_device(device);
 160                 if (rc)
 161                         return rc;
 162         }
 163         return 0;
 164 }
 165
 166 static void dasd_stats_all_block_off(void)
 167 {
 168         int i;
 169         struct dasd_device *device;
 170
 171         for (i = 0; i < dasd_max_devindex; ++i) {
 172                 device = dasd_device_from_devindex(i);
 173                 if (IS_ERR(device))
 174                         continue;
 175                 if (device->block)
 176                         dasd_profile_off(&device->block->profile);
 177                 dasd_put_device(device);
 178         }
 179 }
 180
 181 static void dasd_stats_all_block_reset(void)
 182 {
 183         int i;
 184         struct dasd_device *device;
 185
 186         for (i = 0; i < dasd_max_devindex; ++i) {
 187                 device = dasd_device_from_devindex(i);
 188                 if (IS_ERR(device))
 189                         continue;
 190                 if (device->block)
 191                         dasd_profile_reset(&device->block->profile);
 192                 dasd_put_device(device);
 193         }
 194 }
 195
 196 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
 197 {
 198         int i;
 199
 200         for (i = 0; i < 32; i++) {
 201                 seq_printf(m, "%7d ", array[i] / factor);
 202                 if (i == 15)
 203                         seq_putc(m, '\n');
 204         }
 205         seq_putc(m, '\n');
 206 }
 207 #endif /* CONFIG_DASD_PROFILE */
 208
 209 static int dasd_stats_proc_show(struct seq_file *m, void *v)
 210 {
 211 #ifdef CONFIG_DASD_PROFILE
 212         struct dasd_profile_info *prof;
 213         int factor;
 214
 215         spin_lock_bh(&dasd_global_profile.lock);
 216         prof = dasd_global_profile.data;
 217         if (!prof) {
 218                 spin_unlock_bh(&dasd_global_profile.lock);
 219                 seq_printf(m, "Statistics are off - they might be "
 220                                     "switched on using 'echo set on > "
 221                                     "/proc/dasd/statistics'\n");
 222                 return 0;
 223         }
 224
 225         /* prevent counter 'overflow' on output */
 226         for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
 227              factor *= 10);
 228
 229         seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 230         seq_printf(m, "with %u sectors(512B each)\n",
 231                        prof->dasd_io_sects);
 232         seq_printf(m, "Scale Factor is  %d\n", factor);
 233         seq_printf(m,
 234                        "   __<4    ___8    __16    __32    __64    _128 "
 235                        "   _256    _512    __1k    __2k    __4k    __8k "
 236                        "   _16k    _32k    _64k    128k\n");
 237         seq_printf(m,
 238                        "   _256    _512    __1M    __2M    __4M    __8M "
 239                        "   _16M    _32M    _64M    128M    256M    512M "
 240                        "   __1G    __2G    __4G " "   _>4G\n");
 241
 242         seq_printf(m, "Histogram of sizes (512B secs)\n");
 243         dasd_statistics_array(m, prof->dasd_io_secs, factor);
 244         seq_printf(m, "Histogram of I/O times (microseconds)\n");
 245         dasd_statistics_array(m, prof->dasd_io_times, factor);
 246         seq_printf(m, "Histogram of I/O times per sector\n");
 247         dasd_statistics_array(m, prof->dasd_io_timps, factor);
 248         seq_printf(m, "Histogram of I/O time till ssch\n");
 249         dasd_statistics_array(m, prof->dasd_io_time1, factor);
 250         seq_printf(m, "Histogram of I/O time between ssch and irq\n");
 251         dasd_statistics_array(m, prof->dasd_io_time2, factor);
 252         seq_printf(m, "Histogram of I/O time between ssch "
 253                             "and irq per sector\n");
 254         dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
 255         seq_printf(m, "Histogram of I/O time between irq and end\n");
 256         dasd_statistics_array(m, prof->dasd_io_time3, factor);
 257         seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
 258         dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
 259         spin_unlock_bh(&dasd_global_profile.lock);
 260 #else
 261         seq_printf(m, "Statistics are not activated in this kernel\n");
 262 #endif
 263         return 0;
 264 }
 265
 266 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
 267 {
 268         return single_open(file, dasd_stats_proc_show, NULL);
 269 }
 270
 271 static ssize_t dasd_stats_proc_write(struct file *file,
 272                 const char __user *user_buf, size_t user_len, loff_t *pos)
 273 {
 274 #ifdef CONFIG_DASD_PROFILE
 275         char *buffer, *str;
 276         int rc;
 277
 278         if (user_len > 65536)
 279                 user_len = 65536;
 280         buffer = dasd_get_user_string(user_buf, user_len);
 281         if (IS_ERR(buffer))
 282                 return PTR_ERR(buffer);
 283
 284         /* check for valid verbs */
 285         str = skip_spaces(buffer);
 286         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 287                 /* 'set xxx' was given */
 288                 str = skip_spaces(str + 4);
 289                 if (strcmp(str, "on") == 0) {
 290                         /* switch on statistics profiling */
 291                         rc = dasd_stats_all_block_on();
 292                         if (rc) {
 293                                 dasd_stats_all_block_off();
 294                                 goto out_error;
 295                         }
 296                         rc = dasd_profile_on(&dasd_global_profile);
 297                         if (rc) {
 298                                 dasd_stats_all_block_off();
 299                                 goto out_error;
 300                         }
 301                         dasd_profile_reset(&dasd_global_profile);
 302                         dasd_global_profile_level = DASD_PROFILE_ON;
 303                         pr_info("The statistics feature has been switched "
 304                                 "on\n");
 305                 } else if (strcmp(str, "off") == 0) {
 306                         /* switch off statistics profiling */
 307                         dasd_global_profile_level = DASD_PROFILE_OFF;
 308                         dasd_profile_off(&dasd_global_profile);
 309                         dasd_stats_all_block_off();
 310                         pr_info("The statistics feature has been switched "
 311                                 "off\n");
 312                 } else
 313                         goto out_parse_error;
 314         } else if (strncmp(str, "reset", 5) == 0) {
 315                 /* reset the statistics */
 316                 dasd_profile_reset(&dasd_global_profile);
 317                 dasd_stats_all_block_reset();
 318                 pr_info("The statistics have been reset\n");
 319         } else
 320                 goto out_parse_error;
 321         vfree(buffer);
 322         return user_len;
 323 out_parse_error:
 324         rc = -EINVAL;
 325         pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
 326 out_error:
 327         vfree(buffer);
 328         return rc;
 329 #else
 330         pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
 331         return user_len;
 332 #endif                          /* CONFIG_DASD_PROFILE */
 333 }
 334
 335 static const struct file_operations dasd_stats_proc_fops = {
 336         .owner          = THIS_MODULE,
 337         .open           = dasd_stats_proc_open,
 338         .read           = seq_read,
 339         .llseek         = seq_lseek,
 340         .release        = single_release,
 341         .write          = dasd_stats_proc_write,
 342 };
 343
 344 /*
 345  * Create dasd proc-fs entries.
 346  * In case creation failed, cleanup and return -ENOENT.
 347  */
 348 int
 349 dasd_proc_init(void)
 350 {
 351         dasd_proc_root_entry = proc_mkdir("dasd", NULL);
 352         if (!dasd_proc_root_entry)
 353                 goto out_nodasd;
 354         dasd_devices_entry = proc_create("devices",
 355                                          S_IFREG | S_IRUGO | S_IWUSR,
 356                                          dasd_proc_root_entry,
 357                                          &dasd_devices_file_ops);
 358         if (!dasd_devices_entry)
 359                 goto out_nodevices;
 360         dasd_statistics_entry = proc_create("statistics",
 361                                             S_IFREG | S_IRUGO | S_IWUSR,
 362                                             dasd_proc_root_entry,
 363                                             &dasd_stats_proc_fops);
 364         if (!dasd_statistics_entry)
 365                 goto out_nostatistics;
 366         return 0;
 367
 368  out_nostatistics:
 369         remove_proc_entry("devices", dasd_proc_root_entry);
 370  out_nodevices:
 371         remove_proc_entry("dasd", NULL);
 372  out_nodasd:
 373         return -ENOENT;
 374 }
 375
 376 void
 377 dasd_proc_exit(void)
 378 {
 379         remove_proc_entry("devices", dasd_proc_root_entry);
 380         remove_proc_entry("statistics", dasd_proc_root_entry);
 381         remove_proc_entry("dasd", NULL);
 382 }