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: 1.30 $
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/ctype.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/vmalloc.h>
  19
  20 #include <asm/debug.h>
  21 #include <asm/uaccess.h>
  22
  23 /* This is ugly... */
  24 #define PRINTK_HEADER "dasd_proc:"
  25
  26 #include "dasd_int.h"
  27
  28 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
  29 static struct proc_dir_entry *dasd_devices_entry = NULL;
  30 static struct proc_dir_entry *dasd_statistics_entry = NULL;
  31
  32 static inline 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
  52 static int
  53 dasd_devices_show(struct seq_file *m, void *v)
  54 {
  55         struct dasd_device *device;
  56         char *substr;
  57
  58         device = dasd_device_from_devindex((unsigned long) v - 1);
  59         if (IS_ERR(device))
  60                 return 0;
  61         /* Print device number. */
  62         seq_printf(m, "%s", device->cdev->dev.bus_id);
  63         /* Print discipline string. */
  64         if (device != NULL && device->discipline != NULL)
  65                 seq_printf(m, "(%s)", device->discipline->name);
  66         else
  67                 seq_printf(m, "(none)");
  68         /* Print kdev. */
  69         if (device->gdp)
  70                 seq_printf(m, " at (%3d:%6d)",
  71                            device->gdp->major, device->gdp->first_minor);
  72         else
  73                 seq_printf(m, "  at (???:??????)");
  74         /* Print device name. */
  75         if (device->gdp)
  76                 seq_printf(m, " is %-8s", device->gdp->disk_name);
  77         else
  78                 seq_printf(m, " is ????????");
  79         /* Print devices features. */
  80         substr = test_bit(DASD_FLAG_RO, &device->flags) ? "(ro)" : " ";
  81         seq_printf(m, "%4s: ", substr);
  82         /* Print device status information. */
  83         switch ((device != NULL) ? device->state : -1) {
  84         case -1:
  85                 seq_printf(m, "unknown");
  86                 break;
  87         case DASD_STATE_NEW:
  88                 seq_printf(m, "new");
  89                 break;
  90         case DASD_STATE_KNOWN:
  91                 seq_printf(m, "detected");
  92                 break;
  93         case DASD_STATE_BASIC:
  94                 seq_printf(m, "basic");
  95                 break;
  96         case DASD_STATE_READY:
  97         case DASD_STATE_ONLINE:
  98                 seq_printf(m, "active ");
  99                 if (dasd_check_blocksize(device->bp_block))
 100                         seq_printf(m, "n/f       ");
 101                 else
 102                         seq_printf(m,
 103                                    "at blocksize: %d, %ld blocks, %ld MB",
 104                                    device->bp_block, device->blocks,
 105                                    ((device->bp_block >> 9) *
 106                                     device->blocks) >> 11);
 107                 break;
 108         default:
 109                 seq_printf(m, "no stat");
 110                 break;
 111         }
 112         dasd_put_device(device);
 113         if (dasd_probeonly)
 114                 seq_printf(m, "(probeonly)");
 115         seq_printf(m, "\n");
 116         return 0;
 117 }
 118
 119 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 120 {
 121         if (*pos >= dasd_max_devindex)
 122                 return NULL;
 123         return (void *)((unsigned long) *pos + 1);
 124 }
 125
 126 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 127 {
 128         ++*pos;
 129         return dasd_devices_start(m, pos);
 130 }
 131
 132 static void dasd_devices_stop(struct seq_file *m, void *v)
 133 {
 134 }
 135
 136 static struct seq_operations dasd_devices_seq_ops = {
 137         .start          = dasd_devices_start,
 138         .next           = dasd_devices_next,
 139         .stop           = dasd_devices_stop,
 140         .show           = dasd_devices_show,
 141 };
 142
 143 static int dasd_devices_open(struct inode *inode, struct file *file)
 144 {
 145         return seq_open(file, &dasd_devices_seq_ops);
 146 }
 147
 148 static struct file_operations dasd_devices_file_ops = {
 149         .open           = dasd_devices_open,
 150         .read           = seq_read,
 151         .llseek         = seq_lseek,
 152         .release        = seq_release,
 153 };
 154
 155 static inline int
 156 dasd_calc_metrics(char *page, char **start, off_t off,
 157                   int count, int *eof, int len)
 158 {
 159         len = (len > off) ? len - off : 0;
 160         if (len > count)
 161                 len = count;
 162         if (len < count)
 163                 *eof = 1;
 164         *start = page + off;
 165         return len;
 166 }
 167
 168 static inline char *
 169 dasd_statistics_array(char *str, int *array, int shift)
 170 {
 171         int i;
 172
 173         for (i = 0; i < 32; i++) {
 174                 str += sprintf(str, "%7d ", array[i] >> shift);
 175                 if (i == 15)
 176                         str += sprintf(str, "\n");
 177         }
 178         str += sprintf(str,"\n");
 179         return str;
 180 }
 181
 182 static int
 183 dasd_statistics_read(char *page, char **start, off_t off,
 184                      int count, int *eof, void *data)
 185 {
 186         unsigned long len;
 187 #ifdef CONFIG_DASD_PROFILE
 188         struct dasd_profile_info_t *prof;
 189         char *str;
 190         int shift;
 191
 192         /* check for active profiling */
 193         if (dasd_profile_level == DASD_PROFILE_OFF) {
 194                 len = sprintf(page, "Statistics are off - they might be "
 195                                     "switched on using 'echo set on > "
 196                                     "/proc/dasd/statistics'\n");
 197                 return dasd_calc_metrics(page, start, off, count, eof, len);
 198         }
 199
 200         prof = &dasd_global_profile;
 201         /* prevent couter 'overflow' on output */
 202         for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
 203
 204         str = page;
 205         str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 206         str += sprintf(str, "with %d sectors(512B each)\n",
 207                        prof->dasd_io_sects);
 208         str += sprintf(str,
 209                        "   __<4    ___8    __16    __32    __64    _128 "
 210                        "   _256    _512    __1k    __2k    __4k    __8k "
 211                        "   _16k    _32k    _64k    128k\n");
 212         str += sprintf(str,
 213                        "   _256    _512    __1M    __2M    __4M    __8M "
 214                        "   _16M    _32M    _64M    128M    256M    512M "
 215                        "   __1G    __2G    __4G " "   _>4G\n");
 216
 217         str += sprintf(str, "Histogram of sizes (512B secs)\n");
 218         str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
 219         str += sprintf(str, "Histogram of I/O times (microseconds)\n");
 220         str = dasd_statistics_array(str, prof->dasd_io_times, shift);
 221         str += sprintf(str, "Histogram of I/O times per sector\n");
 222         str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
 223         str += sprintf(str, "Histogram of I/O time till ssch\n");
 224         str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
 225         str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
 226         str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
 227         str += sprintf(str, "Histogram of I/O time between ssch "
 228                             "and irq per sector\n");
 229         str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
 230         str += sprintf(str, "Histogram of I/O time between irq and end\n");
 231         str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
 232         str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
 233         str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
 234         len = str - page;
 235 #else
 236         len = sprintf(page, "Statistics are not activated in this kernel\n");
 237 #endif
 238         return dasd_calc_metrics(page, start, off, count, eof, len);
 239 }
 240
 241 static int
 242 dasd_statistics_write(struct file *file, const char __user *user_buf,
 243                       unsigned long user_len, void *data)
 244 {
 245 #ifdef CONFIG_DASD_PROFILE
 246         char *buffer, *str;
 247
 248         if (user_len > 65536)
 249                 user_len = 65536;
 250         buffer = dasd_get_user_string(user_buf, user_len);
 251         if (IS_ERR(buffer))
 252                 return PTR_ERR(buffer);
 253         MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
 254
 255         /* check for valid verbs */
 256         for (str = buffer; isspace(*str); str++);
 257         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 258                 /* 'set xxx' was given */
 259                 for (str = str + 4; isspace(*str); str++);
 260                 if (strcmp(str, "on") == 0) {
 261                         /* switch on statistics profiling */
 262                         dasd_profile_level = DASD_PROFILE_ON;
 263                         MESSAGE(KERN_INFO, "%s", "Statistics switched on");
 264                 } else if (strcmp(str, "off") == 0) {
 265                         /* switch off and reset statistics profiling */
 266                         memset(&dasd_global_profile,
 267                                0, sizeof (struct dasd_profile_info_t));
 268                         dasd_profile_level = DASD_PROFILE_OFF;
 269                         MESSAGE(KERN_INFO, "%s", "Statistics switched off");
 270                 } else
 271                         goto out_error;
 272         } else if (strncmp(str, "reset", 5) == 0) {
 273                 /* reset the statistics */
 274                 memset(&dasd_global_profile, 0,
 275                        sizeof (struct dasd_profile_info_t));
 276                 MESSAGE(KERN_INFO, "%s", "Statistics reset");
 277         } else
 278                 goto out_error;
 279         kfree(buffer);
 280         return user_len;
 281 out_error:
 282         MESSAGE(KERN_WARNING, "%s",
 283                 "/proc/dasd/statistics: only 'set on', 'set off' "
 284                 "and 'reset' are supported verbs");
 285         kfree(buffer);
 286         return -EINVAL;
 287 #else
 288         MESSAGE(KERN_WARNING, "%s",
 289                 "/proc/dasd/statistics: is not activated in this kernel");
 290         return user_len;
 291 #endif                          /* CONFIG_DASD_PROFILE */
 292 }
 293
 294 int
 295 dasd_proc_init(void)
 296 {
 297         dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
 298         dasd_proc_root_entry->owner = THIS_MODULE;
 299         dasd_devices_entry = create_proc_entry("devices",
 300                                                S_IFREG | S_IRUGO | S_IWUSR,
 301                                                dasd_proc_root_entry);
 302         dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
 303         dasd_devices_entry->owner = THIS_MODULE;
 304         dasd_statistics_entry = create_proc_entry("statistics",
 305                                                   S_IFREG | S_IRUGO | S_IWUSR,
 306                                                   dasd_proc_root_entry);
 307         dasd_statistics_entry->read_proc = dasd_statistics_read;
 308         dasd_statistics_entry->write_proc = dasd_statistics_write;
 309         dasd_statistics_entry->owner = THIS_MODULE;
 310         return 0;
 311 }
 312
 313 void
 314 dasd_proc_exit(void)
 315 {
 316         remove_proc_entry("devices", dasd_proc_root_entry);
 317         remove_proc_entry("statistics", dasd_proc_root_entry);
 318         remove_proc_entry("dasd", &proc_root);
 319 }