drivers/s390/block/dasd_proc.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_proc.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
   9  *
  10  * /proc interface for the dasd driver.
  11  *
  12  */
  13
  14 #include <linux/ctype.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/proc_fs.h>
  18
  19 #include <asm/debug.h>
  20 #include <asm/uaccess.h>
  21
  22 /* This is ugly... */
  23 #define PRINTK_HEADER "dasd_proc:"
  24
  25 #include "dasd_int.h"
  26
  27 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
  28 static struct proc_dir_entry *dasd_devices_entry = NULL;
  29 static struct proc_dir_entry *dasd_statistics_entry = NULL;
  30
  31 #ifdef CONFIG_DASD_PROFILE
  32 static char *
  33 dasd_get_user_string(const char __user *user_buf, size_t user_len)
  34 {
  35         char *buffer;
  36
  37         buffer = kmalloc(user_len + 1, GFP_KERNEL);
  38         if (buffer == NULL)
  39                 return ERR_PTR(-ENOMEM);
  40         if (copy_from_user(buffer, user_buf, user_len) != 0) {
  41                 kfree(buffer);
  42                 return ERR_PTR(-EFAULT);
  43         }
  44         /* got the string, now strip linefeed. */
  45         if (buffer[user_len - 1] == '\n')
  46                 buffer[user_len - 1] = 0;
  47         else
  48                 buffer[user_len] = 0;
  49         return buffer;
  50 }
  51 #endif /* CONFIG_DASD_PROFILE */
  52
  53 static int
  54 dasd_devices_show(struct seq_file *m, void *v)
  55 {
  56         struct dasd_device *device;
  57         char *substr;
  58
  59         device = dasd_device_from_devindex((unsigned long) v - 1);
  60         if (IS_ERR(device))
  61                 return 0;
  62         /* Print device number. */
  63         seq_printf(m, "%s", device->cdev->dev.bus_id);
  64         /* Print discipline string. */
  65         if (device != NULL && device->discipline != NULL)
  66                 seq_printf(m, "(%s)", device->discipline->name);
  67         else
  68                 seq_printf(m, "(none)");
  69         /* Print kdev. */
  70         if (device->gdp)
  71                 seq_printf(m, " at (%3d:%6d)",
  72                            device->gdp->major, device->gdp->first_minor);
  73         else
  74                 seq_printf(m, "  at (???:??????)");
  75         /* Print device name. */
  76         if (device->gdp)
  77                 seq_printf(m, " is %-8s", device->gdp->disk_name);
  78         else
  79                 seq_printf(m, " is ????????");
  80         /* Print devices features. */
  81         substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
  82         seq_printf(m, "%4s: ", substr);
  83         /* Print device status information. */
  84         switch ((device != NULL) ? device->state : -1) {
  85         case -1:
  86                 seq_printf(m, "unknown");
  87                 break;
  88         case DASD_STATE_NEW:
  89                 seq_printf(m, "new");
  90                 break;
  91         case DASD_STATE_KNOWN:
  92                 seq_printf(m, "detected");
  93                 break;
  94         case DASD_STATE_BASIC:
  95                 seq_printf(m, "basic");
  96                 break;
  97         case DASD_STATE_UNFMT:
  98                 seq_printf(m, "unformatted");
  99                 break;
 100         case DASD_STATE_READY:
 101         case DASD_STATE_ONLINE:
 102                 seq_printf(m, "active ");
 103                 if (dasd_check_blocksize(device->bp_block))
 104                         seq_printf(m, "n/f       ");
 105                 else
 106                         seq_printf(m,
 107                                    "at blocksize: %d, %ld blocks, %ld MB",
 108                                    device->bp_block, device->blocks,
 109                                    ((device->bp_block >> 9) *
 110                                     device->blocks) >> 11);
 111                 break;
 112         default:
 113                 seq_printf(m, "no stat");
 114                 break;
 115         }
 116         dasd_put_device(device);
 117         if (dasd_probeonly)
 118                 seq_printf(m, "(probeonly)");
 119         seq_printf(m, "\n");
 120         return 0;
 121 }
 122
 123 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 124 {
 125         if (*pos >= dasd_max_devindex)
 126                 return NULL;
 127         return (void *)((unsigned long) *pos + 1);
 128 }
 129
 130 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 131 {
 132         ++*pos;
 133         return dasd_devices_start(m, pos);
 134 }
 135
 136 static void dasd_devices_stop(struct seq_file *m, void *v)
 137 {
 138 }
 139
 140 static struct seq_operations dasd_devices_seq_ops = {
 141         .start          = dasd_devices_start,
 142         .next           = dasd_devices_next,
 143         .stop           = dasd_devices_stop,
 144         .show           = dasd_devices_show,
 145 };
 146
 147 static int dasd_devices_open(struct inode *inode, struct file *file)
 148 {
 149         return seq_open(file, &dasd_devices_seq_ops);
 150 }
 151
 152 static const struct file_operations dasd_devices_file_ops = {
 153         .open           = dasd_devices_open,
 154         .read           = seq_read,
 155         .llseek         = seq_lseek,
 156         .release        = seq_release,
 157 };
 158
 159 static int
 160 dasd_calc_metrics(char *page, char **start, off_t off,
 161                   int count, int *eof, int len)
 162 {
 163         len = (len > off) ? len - off : 0;
 164         if (len > count)
 165                 len = count;
 166         if (len < count)
 167                 *eof = 1;
 168         *start = page + off;
 169         return len;
 170 }
 171
 172 #ifdef CONFIG_DASD_PROFILE
 173 static char *
 174 dasd_statistics_array(char *str, unsigned int *array, int shift)
 175 {
 176         int i;
 177
 178         for (i = 0; i < 32; i++) {
 179                 str += sprintf(str, "%7d ", array[i] >> shift);
 180                 if (i == 15)
 181                         str += sprintf(str, "\n");
 182         }
 183         str += sprintf(str,"\n");
 184         return str;
 185 }
 186 #endif /* CONFIG_DASD_PROFILE */
 187
 188 static int
 189 dasd_statistics_read(char *page, char **start, off_t off,
 190                      int count, int *eof, void *data)
 191 {
 192         unsigned long len;
 193 #ifdef CONFIG_DASD_PROFILE
 194         struct dasd_profile_info_t *prof;
 195         char *str;
 196         int shift;
 197
 198         /* check for active profiling */
 199         if (dasd_profile_level == DASD_PROFILE_OFF) {
 200                 len = sprintf(page, "Statistics are off - they might be "
 201                                     "switched on using 'echo set on > "
 202                                     "/proc/dasd/statistics'\n");
 203                 return dasd_calc_metrics(page, start, off, count, eof, len);
 204         }
 205
 206         prof = &dasd_global_profile;
 207         /* prevent couter 'overflow' on output */
 208         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
 209
 210         str = page;
 211         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 212         str += sprintf(str, "with %d sectors(512B each)\n",
 213                        prof->dasd_io_sects);
 214         str += sprintf(str,
 215                        "   __<4    ___8    __16    __32    __64    _128 "
 216                        "   _256    _512    __1k    __2k    __4k    __8k "
 217                        "   _16k    _32k    _64k    128k\n");
 218         str += sprintf(str,
 219                        "   _256    _512    __1M    __2M    __4M    __8M "
 220                        "   _16M    _32M    _64M    128M    256M    512M "
 221                        "   __1G    __2G    __4G " "   _>4G\n");
 222
 223         str += sprintf(str, "Histogram of sizes (512B secs)\n");
 224         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 225         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 226         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 227         str += sprintf(str, "Histogram of I/O times per sector\n");
 228         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 229         str += sprintf(str, "Histogram of I/O time till ssch\n");
 230         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 231         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 232         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 233         str += sprintf(str, "Histogram of I/O time between ssch "
 234                             "and irq per sector\n");
 235         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 236         str += sprintf(str, "Histogram of I/O time between irq and end\n");
 237         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 238         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 239         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 240         len = str - page;
 241 #else
 242         len = sprintf(page, "Statistics are not activated in this kernel\n");
 243 #endif
 244         return dasd_calc_metrics(page, start, off, count, eof, len);
 245 }
 246
 247 static int
 248 dasd_statistics_write(struct file *file, const char __user *user_buf,
 249                       unsigned long user_len, void *data)
 250 {
 251 #ifdef CONFIG_DASD_PROFILE
 252         char *buffer, *str;
 253
 254         if (user_len > 65536)
 255                 user_len = 65536;
 256         buffer = dasd_get_user_string(user_buf, user_len);
 257         if (IS_ERR(buffer))
 258                 return PTR_ERR(buffer);
 259         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
 260
 261         /* check for valid verbs */
 262         for (str = buffer; isspace(*str); str++);
 263         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 264                 /* 'set xxx' was given */
 265                 for (str = str + 4; isspace(*str); str++);
 266                 if (strcmp(str, "on") == 0) {
 267                         /* switch on statistics profiling */
 268                         dasd_profile_level = DASD_PROFILE_ON;
 269                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 270                 } else if (strcmp(str, "off") == 0) {
 271                         /* switch off and reset statistics profiling */
 272                         memset(&dasd_global_profile,
 273                                0, sizeof (struct dasd_profile_info_t));
 274                         dasd_profile_level = DASD_PROFILE_OFF;
 275                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 276                 } else
 277                         goto out_error;
 278         } else if (strncmp(str, "reset", 5) == 0) {
 279                 /* reset the statistics */
 280                 memset(&dasd_global_profile, 0,
 281                        sizeof (struct dasd_profile_info_t));
 282                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
 283         } else
 284                 goto out_error;
 285         kfree(buffer);
 286         return user_len;
 287 out_error:
 288         MESSAGE(KERN_WARNING, "%s",
 289                 "/proc/dasd/statistics: only 'set on', 'set off' "
 290                 "and 'reset' are supported verbs");
 291         kfree(buffer);
 292         return -EINVAL;
 293 #else
 294         MESSAGE(KERN_WARNING, "%s",
 295                 "/proc/dasd/statistics: is not activated in this kernel");
 296         return user_len;
 297 #endif                          /* CONFIG_DASD_PROFILE */
 298 }
 299
 300 /*
 301  * Create dasd proc-fs entries.
 302  * In case creation failed, cleanup and return -ENOENT.
 303  */
 304 int
 305 dasd_proc_init(void)
 306 {
 307         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
 308         if (!dasd_proc_root_entry)
 309                 goto out_nodasd;
 310         dasd_proc_root_entry->owner = THIS_MODULE;
 311         dasd_devices_entry = create_proc_entry("devices",
 312                                                S_IFREG | S_IRUGO | S_IWUSR,
 313                                                dasd_proc_root_entry);
 314         if (!dasd_devices_entry)
 315                 goto out_nodevices;
 316         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 317         dasd_devices_entry->owner = THIS_MODULE;
 318         dasd_statistics_entry = create_proc_entry("statistics",
 319                                                   S_IFREG | S_IRUGO | S_IWUSR,
 320                                                   dasd_proc_root_entry);
 321         if (!dasd_statistics_entry)
 322                 goto out_nostatistics;
 323         dasd_statistics_entry->read_proc = dasd_statistics_read;
 324         dasd_statistics_entry->write_proc = dasd_statistics_write;
 325         dasd_statistics_entry->owner = THIS_MODULE;
 326         return 0;
 327
 328  out_nostatistics:
 329         remove_proc_entry("devices", dasd_proc_root_entry);
 330  out_nodevices:
 331         remove_proc_entry("dasd", &proc_root);
 332  out_nodasd:
 333         return -ENOENT;
 334 }
 335
 336 void
 337 dasd_proc_exit(void)
 338 {
 339         remove_proc_entry("devices", dasd_proc_root_entry);
 340         remove_proc_entry("statistics", dasd_proc_root_entry);
 341         remove_proc_entry("dasd", &proc_root);
 342 }