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