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         struct dasd_block *block;
  58         char *substr;
  59
  60         device = dasd_device_from_devindex((unsigned long) v - 1);
  61         if (IS_ERR(device))
  62                 return 0;
  63         if (device->block)
  64                 block = device->block;
  65 <<<<<<< HEAD:drivers/s390/block/dasd_proc.c
  66         else
  67 =======
  68         else {
  69                 dasd_put_device(device);
  70 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/s390/block/dasd_proc.c
  71                 return 0;
  72 <<<<<<< HEAD:drivers/s390/block/dasd_proc.c
  73 =======
  74         }
  75 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/s390/block/dasd_proc.c
  76         /* Print device number. */
  77         seq_printf(m, "%s", device->cdev->dev.bus_id);
  78         /* Print discipline string. */
  79         if (device != NULL && device->discipline != NULL)
  80                 seq_printf(m, "(%s)", device->discipline->name);
  81         else
  82                 seq_printf(m, "(none)");
  83         /* Print kdev. */
  84         if (block->gdp)
  85                 seq_printf(m, " at (%3d:%6d)",
  86                            block->gdp->major, block->gdp->first_minor);
  87         else
  88                 seq_printf(m, "  at (???:??????)");
  89         /* Print device name. */
  90         if (block->gdp)
  91                 seq_printf(m, " is %-8s", block->gdp->disk_name);
  92         else
  93                 seq_printf(m, " is ????????");
  94         /* Print devices features. */
  95         substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
  96         seq_printf(m, "%4s: ", substr);
  97         /* Print device status information. */
  98         switch ((device != NULL) ? device->state : -1) {
  99         case -1:
 100                 seq_printf(m, "unknown");
 101                 break;
 102         case DASD_STATE_NEW:
 103                 seq_printf(m, "new");
 104                 break;
 105         case DASD_STATE_KNOWN:
 106                 seq_printf(m, "detected");
 107                 break;
 108         case DASD_STATE_BASIC:
 109                 seq_printf(m, "basic");
 110                 break;
 111         case DASD_STATE_UNFMT:
 112                 seq_printf(m, "unformatted");
 113                 break;
 114         case DASD_STATE_READY:
 115         case DASD_STATE_ONLINE:
 116                 seq_printf(m, "active ");
 117                 if (dasd_check_blocksize(block->bp_block))
 118                         seq_printf(m, "n/f       ");
 119                 else
 120                         seq_printf(m,
 121                                    "at blocksize: %d, %ld blocks, %ld MB",
 122                                    block->bp_block, block->blocks,
 123                                    ((block->bp_block >> 9) *
 124                                     block->blocks) >> 11);
 125                 break;
 126         default:
 127                 seq_printf(m, "no stat");
 128                 break;
 129         }
 130         dasd_put_device(device);
 131         if (dasd_probeonly)
 132                 seq_printf(m, "(probeonly)");
 133         seq_printf(m, "\n");
 134         return 0;
 135 }
 136
 137 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 138 {
 139         if (*pos >= dasd_max_devindex)
 140                 return NULL;
 141         return (void *)((unsigned long) *pos + 1);
 142 }
 143
 144 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 145 {
 146         ++*pos;
 147         return dasd_devices_start(m, pos);
 148 }
 149
 150 static void dasd_devices_stop(struct seq_file *m, void *v)
 151 {
 152 }
 153
 154 static const struct seq_operations dasd_devices_seq_ops = {
 155         .start          = dasd_devices_start,
 156         .next           = dasd_devices_next,
 157         .stop           = dasd_devices_stop,
 158         .show           = dasd_devices_show,
 159 };
 160
 161 static int dasd_devices_open(struct inode *inode, struct file *file)
 162 {
 163         return seq_open(file, &dasd_devices_seq_ops);
 164 }
 165
 166 static const struct file_operations dasd_devices_file_ops = {
 167         .open           = dasd_devices_open,
 168         .read           = seq_read,
 169         .llseek         = seq_lseek,
 170         .release        = seq_release,
 171 };
 172
 173 static int
 174 dasd_calc_metrics(char *page, char **start, off_t off,
 175                   int count, int *eof, int len)
 176 {
 177         len = (len > off) ? len - off : 0;
 178         if (len > count)
 179                 len = count;
 180         if (len < count)
 181                 *eof = 1;
 182         *start = page + off;
 183         return len;
 184 }
 185
 186 #ifdef CONFIG_DASD_PROFILE
 187 static char *
 188 dasd_statistics_array(char *str, unsigned int *array, int shift)
 189 {
 190         int i;
 191
 192         for (i = 0; i < 32; i++) {
 193                 str += sprintf(str, "%7d ", array[i] >> shift);
 194                 if (i == 15)
 195                         str += sprintf(str, "\n");
 196         }
 197         str += sprintf(str,"\n");
 198         return str;
 199 }
 200 #endif /* CONFIG_DASD_PROFILE */
 201
 202 static int
 203 dasd_statistics_read(char *page, char **start, off_t off,
 204                      int count, int *eof, void *data)
 205 {
 206         unsigned long len;
 207 #ifdef CONFIG_DASD_PROFILE
 208         struct dasd_profile_info_t *prof;
 209         char *str;
 210         int shift;
 211
 212         /* check for active profiling */
 213         if (dasd_profile_level == DASD_PROFILE_OFF) {
 214                 len = sprintf(page, "Statistics are off - they might be "
 215                                     "switched on using 'echo set on > "
 216                                     "/proc/dasd/statistics'\n");
 217                 return dasd_calc_metrics(page, start, off, count, eof, len);
 218         }
 219
 220         prof = &dasd_global_profile;
 221         /* prevent couter 'overflow' on output */
 222         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
 223
 224         str = page;
 225         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 226         str += sprintf(str, "with %d sectors(512B each)\n",
 227                        prof->dasd_io_sects);
 228         str += sprintf(str,
 229                        "   __<4    ___8    __16    __32    __64    _128 "
 230                        "   _256    _512    __1k    __2k    __4k    __8k "
 231                        "   _16k    _32k    _64k    128k\n");
 232         str += sprintf(str,
 233                        "   _256    _512    __1M    __2M    __4M    __8M "
 234                        "   _16M    _32M    _64M    128M    256M    512M "
 235                        "   __1G    __2G    __4G " "   _>4G\n");
 236
 237         str += sprintf(str, "Histogram of sizes (512B secs)\n");
 238         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 239         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 240         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 241         str += sprintf(str, "Histogram of I/O times per sector\n");
 242         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 243         str += sprintf(str, "Histogram of I/O time till ssch\n");
 244         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 245         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 246         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 247         str += sprintf(str, "Histogram of I/O time between ssch "
 248                             "and irq per sector\n");
 249         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 250         str += sprintf(str, "Histogram of I/O time between irq and end\n");
 251         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 252         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 253         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 254         len = str - page;
 255 #else
 256         len = sprintf(page, "Statistics are not activated in this kernel\n");
 257 #endif
 258         return dasd_calc_metrics(page, start, off, count, eof, len);
 259 }
 260
 261 static int
 262 dasd_statistics_write(struct file *file, const char __user *user_buf,
 263                       unsigned long user_len, void *data)
 264 {
 265 #ifdef CONFIG_DASD_PROFILE
 266         char *buffer, *str;
 267
 268         if (user_len > 65536)
 269                 user_len = 65536;
 270         buffer = dasd_get_user_string(user_buf, user_len);
 271         if (IS_ERR(buffer))
 272                 return PTR_ERR(buffer);
 273         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
 274
 275         /* check for valid verbs */
 276         for (str = buffer; isspace(*str); str++);
 277         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 278                 /* 'set xxx' was given */
 279                 for (str = str + 4; isspace(*str); str++);
 280                 if (strcmp(str, "on") == 0) {
 281                         /* switch on statistics profiling */
 282                         dasd_profile_level = DASD_PROFILE_ON;
 283                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 284                 } else if (strcmp(str, "off") == 0) {
 285                         /* switch off and reset statistics profiling */
 286                         memset(&dasd_global_profile,
 287                                0, sizeof (struct dasd_profile_info_t));
 288                         dasd_profile_level = DASD_PROFILE_OFF;
 289                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 290                 } else
 291                         goto out_error;
 292         } else if (strncmp(str, "reset", 5) == 0) {
 293                 /* reset the statistics */
 294                 memset(&dasd_global_profile, 0,
 295                        sizeof (struct dasd_profile_info_t));
 296                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
 297         } else
 298                 goto out_error;
 299         kfree(buffer);
 300         return user_len;
 301 out_error:
 302         MESSAGE(KERN_WARNING, "%s",
 303                 "/proc/dasd/statistics: only 'set on', 'set off' "
 304                 "and 'reset' are supported verbs");
 305         kfree(buffer);
 306         return -EINVAL;
 307 #else
 308         MESSAGE(KERN_WARNING, "%s",
 309                 "/proc/dasd/statistics: is not activated in this kernel");
 310         return user_len;
 311 #endif                          /* CONFIG_DASD_PROFILE */
 312 }
 313
 314 /*
 315  * Create dasd proc-fs entries.
 316  * In case creation failed, cleanup and return -ENOENT.
 317  */
 318 int
 319 dasd_proc_init(void)
 320 {
 321         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
 322         if (!dasd_proc_root_entry)
 323                 goto out_nodasd;
 324         dasd_proc_root_entry->owner = THIS_MODULE;
 325         dasd_devices_entry = create_proc_entry("devices",
 326                                                S_IFREG | S_IRUGO | S_IWUSR,
 327                                                dasd_proc_root_entry);
 328         if (!dasd_devices_entry)
 329                 goto out_nodevices;
 330         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 331         dasd_devices_entry->owner = THIS_MODULE;
 332         dasd_statistics_entry = create_proc_entry("statistics",
 333                                                   S_IFREG | S_IRUGO | S_IWUSR,
 334                                                   dasd_proc_root_entry);
 335         if (!dasd_statistics_entry)
 336                 goto out_nostatistics;
 337         dasd_statistics_entry->read_proc = dasd_statistics_read;
 338         dasd_statistics_entry->write_proc = dasd_statistics_write;
 339         dasd_statistics_entry->owner = THIS_MODULE;
 340         return 0;
 341
 342  out_nostatistics:
 343         remove_proc_entry("devices", dasd_proc_root_entry);
 344  out_nodevices:
 345         remove_proc_entry("dasd", &proc_root);
 346  out_nodasd:
 347         return -ENOENT;
 348 }
 349
 350 void
 351 dasd_proc_exit(void)
 352 {
 353         remove_proc_entry("devices", dasd_proc_root_entry);
 354         remove_proc_entry("statistics", dasd_proc_root_entry);
 355         remove_proc_entry("dasd", &proc_root);
 356 }