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