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  * $Revision: 1.32 $
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/ctype.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/proc_fs.h>
  20
  21 #include <asm/debug.h>
  22 #include <asm/uaccess.h>
  23
  24 /* This is ugly... */
  25 #define PRINTK_HEADER "dasd_proc:"
  26
  27 #include "dasd_int.h"
  28
  29 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
  30 static struct proc_dir_entry *dasd_devices_entry = NULL;
  31 static struct proc_dir_entry *dasd_statistics_entry = NULL;
  32
  33 static inline char *
  34 dasd_get_user_string(const char __user *user_buf, size_t user_len)
  35 {
  36         char *buffer;
  37
  38         buffer = kmalloc(user_len + 1, GFP_KERNEL);
  39         if (buffer == NULL)
  40                 return ERR_PTR(-ENOMEM);
  41         if (copy_from_user(buffer, user_buf, user_len) != 0) {
  42                 kfree(buffer);
  43                 return ERR_PTR(-EFAULT);
  44         }
  45         /* got the string, now strip linefeed. */
  46         if (buffer[user_len - 1] == '\n')
  47                 buffer[user_len - 1] = 0;
  48         else
  49                 buffer[user_len] = 0;
  50         return buffer;
  51 }
  52
  53 static int
  54 dasd_devices_show(struct seq_file *m, void *v)
  55 {
  56         struct dasd_device *device;
  57         char *substr;
  58         int feature;
  59
  60         device = dasd_device_from_devindex((unsigned long) v - 1);
  61         if (IS_ERR(device))
  62                 return 0;
  63         /* Print device number. */
  64         seq_printf(m, "%s", device->cdev->dev.bus_id);
  65         /* Print discipline string. */
  66         if (device != NULL && device->discipline != NULL)
  67                 seq_printf(m, "(%s)", device->discipline->name);
  68         else
  69                 seq_printf(m, "(none)");
  70         /* Print kdev. */
  71         if (device->gdp)
  72                 seq_printf(m, " at (%3d:%6d)",
  73                            device->gdp->major, device->gdp->first_minor);
  74         else
  75                 seq_printf(m, "  at (???:??????)");
  76         /* Print device name. */
  77         if (device->gdp)
  78                 seq_printf(m, " is %-8s", device->gdp->disk_name);
  79         else
  80                 seq_printf(m, " is ????????");
  81         /* Print devices features. */
  82         feature = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY);
  83         if (feature < 0)
  84                 return 0;
  85         substr = feature ? "(ro)" : " ";
  86         seq_printf(m, "%4s: ", substr);
  87         /* Print device status information. */
  88         switch ((device != NULL) ? device->state : -1) {
  89         case -1:
  90                 seq_printf(m, "unknown");
  91                 break;
  92         case DASD_STATE_NEW:
  93                 seq_printf(m, "new");
  94                 break;
  95         case DASD_STATE_KNOWN:
  96                 seq_printf(m, "detected");
  97                 break;
  98         case DASD_STATE_BASIC:
  99                 seq_printf(m, "basic");
 100                 break;
 101         case DASD_STATE_READY:
 102         case DASD_STATE_ONLINE:
 103                 seq_printf(m, "active ");
 104                 if (dasd_check_blocksize(device->bp_block))
 105                         seq_printf(m, "n/f       ");
 106                 else
 107                         seq_printf(m,
 108                                    "at blocksize: %d, %ld blocks, %ld MB",
 109                                    device->bp_block, device->blocks,
 110                                    ((device->bp_block >> 9) *
 111                                     device->blocks) >> 11);
 112                 break;
 113         default:
 114                 seq_printf(m, "no stat");
 115                 break;
 116         }
 117         dasd_put_device(device);
 118         if (dasd_probeonly)
 119                 seq_printf(m, "(probeonly)");
 120         seq_printf(m, "\n");
 121         return 0;
 122 }
 123
 124 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 125 {
 126         if (*pos >= dasd_max_devindex)
 127                 return NULL;
 128         return (void *)((unsigned long) *pos + 1);
 129 }
 130
 131 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 132 {
 133         ++*pos;
 134         return dasd_devices_start(m, pos);
 135 }
 136
 137 static void dasd_devices_stop(struct seq_file *m, void *v)
 138 {
 139 }
 140
 141 static struct seq_operations dasd_devices_seq_ops = {
 142         .start          = dasd_devices_start,
 143         .next           = dasd_devices_next,
 144         .stop           = dasd_devices_stop,
 145         .show           = dasd_devices_show,
 146 };
 147
 148 static int dasd_devices_open(struct inode *inode, struct file *file)
 149 {
 150         return seq_open(file, &dasd_devices_seq_ops);
 151 }
 152
 153 static struct file_operations dasd_devices_file_ops = {
 154         .open           = dasd_devices_open,
 155         .read           = seq_read,
 156         .llseek         = seq_lseek,
 157         .release        = seq_release,
 158 };
 159
 160 static inline int
 161 dasd_calc_metrics(char *page, char **start, off_t off,
 162                   int count, int *eof, int len)
 163 {
 164         len = (len > off) ? len - off : 0;
 165         if (len > count)
 166                 len = count;
 167         if (len < count)
 168                 *eof = 1;
 169         *start = page + off;
 170         return len;
 171 }
 172
 173 static inline char *
 174 dasd_statistics_array(char *str, 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
 187 static int
 188 dasd_statistics_read(char *page, char **start, off_t off,
 189                      int count, int *eof, void *data)
 190 {
 191         unsigned long len;
 192 #ifdef CONFIG_DASD_PROFILE
 193         struct dasd_profile_info_t *prof;
 194         char *str;
 195         int shift;
 196
 197         /* check for active profiling */
 198         if (dasd_profile_level == DASD_PROFILE_OFF) {
 199                 len = sprintf(page, "Statistics are off - they might be "
 200                                     "switched on using 'echo set on > "
 201                                     "/proc/dasd/statistics'\n");
 202                 return dasd_calc_metrics(page, start, off, count, eof, len);
 203         }
 204
 205         prof = &dasd_global_profile;
 206         /* prevent couter 'overflow' on output */
 207         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
 208
 209         str = page;
 210         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 211         str += sprintf(str, "with %d sectors(512B each)\n",
 212                        prof->dasd_io_sects);
 213         str += sprintf(str,
 214                        "   __<4    ___8    __16    __32    __64    _128 "
 215                        "   _256    _512    __1k    __2k    __4k    __8k "
 216                        "   _16k    _32k    _64k    128k\n");
 217         str += sprintf(str,
 218                        "   _256    _512    __1M    __2M    __4M    __8M "
 219                        "   _16M    _32M    _64M    128M    256M    512M "
 220                        "   __1G    __2G    __4G " "   _>4G\n");
 221
 222         str += sprintf(str, "Histogram of sizes (512B secs)\n");
 223         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 224         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 225         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 226         str += sprintf(str, "Histogram of I/O times per sector\n");
 227         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 228         str += sprintf(str, "Histogram of I/O time till ssch\n");
 229         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 230         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 231         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 232         str += sprintf(str, "Histogram of I/O time between ssch "
 233                             "and irq per sector\n");
 234         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 235         str += sprintf(str, "Histogram of I/O time between irq and end\n");
 236         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 237         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 238         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 239         len = str - page;
 240 #else
 241         len = sprintf(page, "Statistics are not activated in this kernel\n");
 242 #endif
 243         return dasd_calc_metrics(page, start, off, count, eof, len);
 244 }
 245
 246 static int
 247 dasd_statistics_write(struct file *file, const char __user *user_buf,
 248                       unsigned long user_len, void *data)
 249 {
 250 #ifdef CONFIG_DASD_PROFILE
 251         char *buffer, *str;
 252
 253         if (user_len > 65536)
 254                 user_len = 65536;
 255         buffer = dasd_get_user_string(user_buf, user_len);
 256         if (IS_ERR(buffer))
 257                 return PTR_ERR(buffer);
 258         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
 259
 260         /* check for valid verbs */
 261         for (str = buffer; isspace(*str); str++);
 262         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 263                 /* 'set xxx' was given */
 264                 for (str = str + 4; isspace(*str); str++);
 265                 if (strcmp(str, "on") == 0) {
 266                         /* switch on statistics profiling */
 267                         dasd_profile_level = DASD_PROFILE_ON;
 268                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 269                 } else if (strcmp(str, "off") == 0) {
 270                         /* switch off and reset statistics profiling */
 271                         memset(&dasd_global_profile,
 272                                0, sizeof (struct dasd_profile_info_t));
 273                         dasd_profile_level = DASD_PROFILE_OFF;
 274                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 275                 } else
 276                         goto out_error;
 277         } else if (strncmp(str, "reset", 5) == 0) {
 278                 /* reset the statistics */
 279                 memset(&dasd_global_profile, 0,
 280                        sizeof (struct dasd_profile_info_t));
 281                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
 282         } else
 283                 goto out_error;
 284         kfree(buffer);
 285         return user_len;
 286 out_error:
 287         MESSAGE(KERN_WARNING, "%s",
 288                 "/proc/dasd/statistics: only 'set on', 'set off' "
 289                 "and 'reset' are supported verbs");
 290         kfree(buffer);
 291         return -EINVAL;
 292 #else
 293         MESSAGE(KERN_WARNING, "%s",
 294                 "/proc/dasd/statistics: is not activated in this kernel");
 295         return user_len;
 296 #endif                          /* CONFIG_DASD_PROFILE */
 297 }
 298
 299 int
 300 dasd_proc_init(void)
 301 {
 302         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
 303         dasd_proc_root_entry->owner = THIS_MODULE;
 304         dasd_devices_entry = create_proc_entry("devices",
 305                                                S_IFREG | S_IRUGO | S_IWUSR,
 306                                                dasd_proc_root_entry);
 307         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 308         dasd_devices_entry->owner = THIS_MODULE;
 309         dasd_statistics_entry = create_proc_entry("statistics",
 310                                                   S_IFREG | S_IRUGO | S_IWUSR,
 311                                                   dasd_proc_root_entry);
 312         dasd_statistics_entry->read_proc = dasd_statistics_read;
 313         dasd_statistics_entry->write_proc = dasd_statistics_write;
 314         dasd_statistics_entry->owner = THIS_MODULE;
 315         return 0;
 316 }
 317
 318 void
 319 dasd_proc_exit(void)
 320 {
 321         remove_proc_entry("devices", dasd_proc_root_entry);
 322         remove_proc_entry("statistics", dasd_proc_root_entry);
 323         remove_proc_entry("dasd", &proc_root);
 324 }