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: 1.33 $
  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
  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_READY:
  98         case DASD_STATE_ONLINE:
  99                 seq_printf(m, "active ");
 100                 if (dasd_check_blocksize(device->bp_block))
 101                         seq_printf(m, "n/f       ");
 102                 else
 103                         seq_printf(m,
 104                                    "at blocksize: %d, %ld blocks, %ld MB",
 105                                    device->bp_block, device->blocks,
 106                                    ((device->bp_block >> 9) *
 107                                     device->blocks) >> 11);
 108                 break;
 109         default:
 110                 seq_printf(m, "no stat");
 111                 break;
 112         }
 113         dasd_put_device(device);
 114         if (dasd_probeonly)
 115                 seq_printf(m, "(probeonly)");
 116         seq_printf(m, "\n");
 117         return 0;
 118 }
 119
 120 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 121 {
 122         if (*pos >= dasd_max_devindex)
 123                 return NULL;
 124         return (void *)((unsigned long) *pos + 1);
 125 }
 126
 127 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 128 {
 129         ++*pos;
 130         return dasd_devices_start(m, pos);
 131 }
 132
 133 static void dasd_devices_stop(struct seq_file *m, void *v)
 134 {
 135 }
 136
 137 static struct seq_operations dasd_devices_seq_ops = {
 138         .start          = dasd_devices_start,
 139         .next           = dasd_devices_next,
 140         .stop           = dasd_devices_stop,
 141         .show           = dasd_devices_show,
 142 };
 143
 144 static int dasd_devices_open(struct inode *inode, struct file *file)
 145 {
 146         return seq_open(file, &dasd_devices_seq_ops);
 147 }
 148
 149 static struct file_operations dasd_devices_file_ops = {
 150         .open           = dasd_devices_open,
 151         .read           = seq_read,
 152         .llseek         = seq_lseek,
 153         .release        = seq_release,
 154 };
 155
 156 static inline int
 157 dasd_calc_metrics(char *page, char **start, off_t off,
 158                   int count, int *eof, int len)
 159 {
 160         len = (len > off) ? len - off : 0;
 161         if (len > count)
 162                 len = count;
 163         if (len < count)
 164                 *eof = 1;
 165         *start = page + off;
 166         return len;
 167 }
 168
 169 static inline char *
 170 dasd_statistics_array(char *str, int *array, int shift)
 171 {
 172         int i;
 173
 174         for (i = 0; i < 32; i++) {
 175                 str += sprintf(str, "%7d ", array[i] >> shift);
 176                 if (i == 15)
 177                         str += sprintf(str, "\n");
 178         }
 179         str += sprintf(str,"\n");
 180         return str;
 181 }
 182
 183 static int
 184 dasd_statistics_read(char *page, char **start, off_t off,
 185                      int count, int *eof, void *data)
 186 {
 187         unsigned long len;
 188 #ifdef CONFIG_DASD_PROFILE
 189         struct dasd_profile_info_t *prof;
 190         char *str;
 191         int shift;
 192
 193         /* check for active profiling */
 194         if (dasd_profile_level == DASD_PROFILE_OFF) {
 195                 len = sprintf(page, "Statistics are off - they might be "
 196                                     "switched on using 'echo set on > "
 197                                     "/proc/dasd/statistics'\n");
 198                 return dasd_calc_metrics(page, start, off, count, eof, len);
 199         }
 200
 201         prof = &dasd_global_profile;
 202         /* prevent couter 'overflow' on output */
 203         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
 204
 205         str = page;
 206         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 207         str += sprintf(str, "with %d sectors(512B each)\n",
 208                        prof->dasd_io_sects);
 209         str += sprintf(str,
 210                        "   __<4    ___8    __16    __32    __64    _128 "
 211                        "   _256    _512    __1k    __2k    __4k    __8k "
 212                        "   _16k    _32k    _64k    128k\n");
 213         str += sprintf(str,
 214                        "   _256    _512    __1M    __2M    __4M    __8M "
 215                        "   _16M    _32M    _64M    128M    256M    512M "
 216                        "   __1G    __2G    __4G " "   _>4G\n");
 217
 218         str += sprintf(str, "Histogram of sizes (512B secs)\n");
 219         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 220         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 221         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 222         str += sprintf(str, "Histogram of I/O times per sector\n");
 223         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 224         str += sprintf(str, "Histogram of I/O time till ssch\n");
 225         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 226         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 227         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 228         str += sprintf(str, "Histogram of I/O time between ssch "
 229                             "and irq per sector\n");
 230         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 231         str += sprintf(str, "Histogram of I/O time between irq and end\n");
 232         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 233         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 234         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 235         len = str - page;
 236 #else
 237         len = sprintf(page, "Statistics are not activated in this kernel\n");
 238 #endif
 239         return dasd_calc_metrics(page, start, off, count, eof, len);
 240 }
 241
 242 static int
 243 dasd_statistics_write(struct file *file, const char __user *user_buf,
 244                       unsigned long user_len, void *data)
 245 {
 246 #ifdef CONFIG_DASD_PROFILE
 247         char *buffer, *str;
 248
 249         if (user_len > 65536)
 250                 user_len = 65536;
 251         buffer = dasd_get_user_string(user_buf, user_len);
 252         if (IS_ERR(buffer))
 253                 return PTR_ERR(buffer);
 254         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
 255
 256         /* check for valid verbs */
 257         for (str = buffer; isspace(*str); str++);
 258         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 259                 /* 'set xxx' was given */
 260                 for (str = str + 4; isspace(*str); str++);
 261                 if (strcmp(str, "on") == 0) {
 262                         /* switch on statistics profiling */
 263                         dasd_profile_level = DASD_PROFILE_ON;
 264                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 265                 } else if (strcmp(str, "off") == 0) {
 266                         /* switch off and reset statistics profiling */
 267                         memset(&dasd_global_profile,
 268                                0, sizeof (struct dasd_profile_info_t));
 269                         dasd_profile_level = DASD_PROFILE_OFF;
 270                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 271                 } else
 272                         goto out_error;
 273         } else if (strncmp(str, "reset", 5) == 0) {
 274                 /* reset the statistics */
 275                 memset(&dasd_global_profile, 0,
 276                        sizeof (struct dasd_profile_info_t));
 277                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
 278         } else
 279                 goto out_error;
 280         kfree(buffer);
 281         return user_len;
 282 out_error:
 283         MESSAGE(KERN_WARNING, "%s",
 284                 "/proc/dasd/statistics: only 'set on', 'set off' "
 285                 "and 'reset' are supported verbs");
 286         kfree(buffer);
 287         return -EINVAL;
 288 #else
 289         MESSAGE(KERN_WARNING, "%s",
 290                 "/proc/dasd/statistics: is not activated in this kernel");
 291         return user_len;
 292 #endif                          /* CONFIG_DASD_PROFILE */
 293 }
 294
 295 int
 296 dasd_proc_init(void)
 297 {
 298         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
 299         dasd_proc_root_entry->owner = THIS_MODULE;
 300         dasd_devices_entry = create_proc_entry("devices",
 301                                                S_IFREG | S_IRUGO | S_IWUSR,
 302                                                dasd_proc_root_entry);
 303         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 304         dasd_devices_entry->owner = THIS_MODULE;
 305         dasd_statistics_entry = create_proc_entry("statistics",
 306                                                   S_IFREG | S_IRUGO | S_IWUSR,
 307                                                   dasd_proc_root_entry);
 308         dasd_statistics_entry->read_proc = dasd_statistics_read;
 309         dasd_statistics_entry->write_proc = dasd_statistics_write;
 310         dasd_statistics_entry->owner = THIS_MODULE;
 311         return 0;
 312 }
 313
 314 void
 315 dasd_proc_exit(void)
 316 {
 317         remove_proc_entry("devices", dasd_proc_root_entry);
 318         remove_proc_entry("statistics", dasd_proc_root_entry);
 319         remove_proc_entry("dasd", &proc_root);
 320 }