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 #define KMSG_COMPONENT "dasd"
  15
  16 #include <linux/ctype.h>
  17 #include <linux/slab.h>
  18 #include <linux/string.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/proc_fs.h>
  22
  23 #include <asm/debug.h>
  24 #include <asm/uaccess.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_proc:"
  28
  29 #include "dasd_int.h"
  30
  31 static struct proc_dir_entry *dasd_proc_root_entry = NULL;
  32 static struct proc_dir_entry *dasd_devices_entry = NULL;
  33 static struct proc_dir_entry *dasd_statistics_entry = NULL;
  34
  35 #ifdef CONFIG_DASD_PROFILE
  36 static char *
  37 dasd_get_user_string(const char __user *user_buf, size_t user_len)
  38 {
  39         char *buffer;
  40
  41         buffer = kmalloc(user_len + 1, GFP_KERNEL);
  42         if (buffer == NULL)
  43                 return ERR_PTR(-ENOMEM);
  44         if (copy_from_user(buffer, user_buf, user_len) != 0) {
  45                 kfree(buffer);
  46                 return ERR_PTR(-EFAULT);
  47         }
  48         /* got the string, now strip linefeed. */
  49         if (buffer[user_len - 1] == '\n')
  50                 buffer[user_len - 1] = 0;
  51         else
  52                 buffer[user_len] = 0;
  53         return buffer;
  54 }
  55 #endif /* CONFIG_DASD_PROFILE */
  56
  57 static int
  58 dasd_devices_show(struct seq_file *m, void *v)
  59 {
  60         struct dasd_device *device;
  61         struct dasd_block *block;
  62         char *substr;
  63
  64         device = dasd_device_from_devindex((unsigned long) v - 1);
  65         if (IS_ERR(device))
  66                 return 0;
  67         if (device->block)
  68                 block = device->block;
  69         else {
  70                 dasd_put_device(device);
  71                 return 0;
  72         }
  73         /* Print device number. */
  74         seq_printf(m, "%s", dev_name(&device->cdev->dev));
  75         /* Print discipline string. */
  76         if (device->discipline != NULL)
  77                 seq_printf(m, "(%s)", device->discipline->name);
  78         else
  79                 seq_printf(m, "(none)");
  80         /* Print kdev. */
  81         if (block->gdp)
  82                 seq_printf(m, " at (%3d:%6d)",
  83                            MAJOR(disk_devt(block->gdp)),
  84                            MINOR(disk_devt(block->gdp)));
  85         else
  86                 seq_printf(m, "  at (???:??????)");
  87         /* Print device name. */
  88         if (block->gdp)
  89                 seq_printf(m, " is %-8s", block->gdp->disk_name);
  90         else
  91                 seq_printf(m, " is ????????");
  92         /* Print devices features. */
  93         substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
  94         seq_printf(m, "%4s: ", substr);
  95         /* Print device status information. */
  96         switch (device->state) {
  97         case DASD_STATE_NEW:
  98                 seq_printf(m, "new");
  99                 break;
 100         case DASD_STATE_KNOWN:
 101                 seq_printf(m, "detected");
 102                 break;
 103         case DASD_STATE_BASIC:
 104                 seq_printf(m, "basic");
 105                 break;
 106         case DASD_STATE_UNFMT:
 107                 seq_printf(m, "unformatted");
 108                 break;
 109         case DASD_STATE_READY:
 110         case DASD_STATE_ONLINE:
 111                 seq_printf(m, "active ");
 112                 if (dasd_check_blocksize(block->bp_block))
 113                         seq_printf(m, "n/f       ");
 114                 else
 115                         seq_printf(m,
 116                                    "at blocksize: %d, %lld blocks, %lld MB",
 117                                    block->bp_block, block->blocks,
 118                                    ((block->bp_block >> 9) *
 119                                     block->blocks) >> 11);
 120                 break;
 121         default:
 122                 seq_printf(m, "no stat");
 123                 break;
 124         }
 125         dasd_put_device(device);
 126         if (dasd_probeonly)
 127                 seq_printf(m, "(probeonly)");
 128         seq_printf(m, "\n");
 129         return 0;
 130 }
 131
 132 static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
 133 {
 134         if (*pos >= dasd_max_devindex)
 135                 return NULL;
 136         return (void *)((unsigned long) *pos + 1);
 137 }
 138
 139 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
 140 {
 141         ++*pos;
 142         return dasd_devices_start(m, pos);
 143 }
 144
 145 static void dasd_devices_stop(struct seq_file *m, void *v)
 146 {
 147 }
 148
 149 static const struct seq_operations dasd_devices_seq_ops = {
 150         .start          = dasd_devices_start,
 151         .next           = dasd_devices_next,
 152         .stop           = dasd_devices_stop,
 153         .show           = dasd_devices_show,
 154 };
 155
 156 static int dasd_devices_open(struct inode *inode, struct file *file)
 157 {
 158         return seq_open(file, &dasd_devices_seq_ops);
 159 }
 160
 161 static const struct file_operations dasd_devices_file_ops = {
 162         .owner          = THIS_MODULE,
 163         .open           = dasd_devices_open,
 164         .read           = seq_read,
 165         .llseek         = seq_lseek,
 166         .release        = seq_release,
 167 };
 168
 169 #ifdef CONFIG_DASD_PROFILE
 170 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
 171 {
 172         int i;
 173
 174         for (i = 0; i < 32; i++) {
 175                 seq_printf(m, "%7d ", array[i] / factor);
 176                 if (i == 15)
 177                         seq_putc(m, '\n');
 178         }
 179         seq_putc(m, '\n');
 180 }
 181 #endif /* CONFIG_DASD_PROFILE */
 182
 183 static int dasd_stats_proc_show(struct seq_file *m, void *v)
 184 {
 185 #ifdef CONFIG_DASD_PROFILE
 186         struct dasd_profile_info_t *prof;
 187         int factor;
 188
 189         /* check for active profiling */
 190         if (dasd_profile_level == DASD_PROFILE_OFF) {
 191                 seq_printf(m, "Statistics are off - they might be "
 192                                     "switched on using 'echo set on > "
 193                                     "/proc/dasd/statistics'\n");
 194                 return 0;
 195         }
 196
 197         prof = &dasd_global_profile;
 198         /* prevent counter 'overflow' on output */
 199         for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
 200              factor *= 10);
 201
 202         seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
 203         seq_printf(m, "with %u sectors(512B each)\n",
 204                        prof->dasd_io_sects);
 205         seq_printf(m, "Scale Factor is  %d\n", factor);
 206         seq_printf(m,
 207                        "   __<4    ___8    __16    __32    __64    _128 "
 208                        "   _256    _512    __1k    __2k    __4k    __8k "
 209                        "   _16k    _32k    _64k    128k\n");
 210         seq_printf(m,
 211                        "   _256    _512    __1M    __2M    __4M    __8M "
 212                        "   _16M    _32M    _64M    128M    256M    512M "
 213                        "   __1G    __2G    __4G " "   _>4G\n");
 214
 215         seq_printf(m, "Histogram of sizes (512B secs)\n");
 216         dasd_statistics_array(m, prof->dasd_io_secs, factor);
 217         seq_printf(m, "Histogram of I/O times (microseconds)\n");
 218         dasd_statistics_array(m, prof->dasd_io_times, factor);
 219         seq_printf(m, "Histogram of I/O times per sector\n");
 220         dasd_statistics_array(m, prof->dasd_io_timps, factor);
 221         seq_printf(m, "Histogram of I/O time till ssch\n");
 222         dasd_statistics_array(m, prof->dasd_io_time1, factor);
 223         seq_printf(m, "Histogram of I/O time between ssch and irq\n");
 224         dasd_statistics_array(m, prof->dasd_io_time2, factor);
 225         seq_printf(m, "Histogram of I/O time between ssch "
 226                             "and irq per sector\n");
 227         dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
 228         seq_printf(m, "Histogram of I/O time between irq and end\n");
 229         dasd_statistics_array(m, prof->dasd_io_time3, factor);
 230         seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
 231         dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
 232 #else
 233         seq_printf(m, "Statistics are not activated in this kernel\n");
 234 #endif
 235         return 0;
 236 }
 237
 238 static int dasd_stats_proc_open(struct inode *inode, struct file *file)
 239 {
 240         return single_open(file, dasd_stats_proc_show, NULL);
 241 }
 242
 243 static ssize_t dasd_stats_proc_write(struct file *file,
 244                 const char __user *user_buf, size_t user_len, loff_t *pos)
 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         DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
 255
 256         /* check for valid verbs */
 257         str = skip_spaces(buffer);
 258         if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
 259                 /* 'set xxx' was given */
 260                 str = skip_spaces(str + 4);
 261                 if (strcmp(str, "on") == 0) {
 262                         /* switch on statistics profiling */
 263                         dasd_profile_level = DASD_PROFILE_ON;
 264                         pr_info("The statistics feature has been switched "
 265                                 "on\n");
 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                         pr_info("The statistics feature has been switched "
 272                                 "off\n");
 273                 } else
 274                         goto out_error;
 275         } else if (strncmp(str, "reset", 5) == 0) {
 276                 /* reset the statistics */
 277                 memset(&dasd_global_profile, 0,
 278                        sizeof (struct dasd_profile_info_t));
 279                 pr_info("The statistics have been reset\n");
 280         } else
 281                 goto out_error;
 282         kfree(buffer);
 283         return user_len;
 284 out_error:
 285         pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
 286                 str);
 287         kfree(buffer);
 288         return -EINVAL;
 289 #else
 290         pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
 291         return user_len;
 292 #endif                          /* CONFIG_DASD_PROFILE */
 293 }
 294
 295 static const struct file_operations dasd_stats_proc_fops = {
 296         .owner          = THIS_MODULE,
 297         .open           = dasd_stats_proc_open,
 298         .read           = seq_read,
 299         .llseek         = seq_lseek,
 300         .release        = single_release,
 301         .write          = dasd_stats_proc_write,
 302 };
 303
 304 /*
 305  * Create dasd proc-fs entries.
 306  * In case creation failed, cleanup and return -ENOENT.
 307  */
 308 int
 309 dasd_proc_init(void)
 310 {
 311         dasd_proc_root_entry = proc_mkdir("dasd", NULL);
 312         if (!dasd_proc_root_entry)
 313                 goto out_nodasd;
 314         dasd_devices_entry = proc_create("devices",
 315                                          S_IFREG | S_IRUGO | S_IWUSR,
 316                                          dasd_proc_root_entry,
 317                                          &dasd_devices_file_ops);
 318         if (!dasd_devices_entry)
 319                 goto out_nodevices;
 320         dasd_statistics_entry = proc_create("statistics",
 321                                             S_IFREG | S_IRUGO | S_IWUSR,
 322                                             dasd_proc_root_entry,
 323                                             &dasd_stats_proc_fops);
 324         if (!dasd_statistics_entry)
 325                 goto out_nostatistics;
 326         return 0;
 327
 328  out_nostatistics:
 329         remove_proc_entry("devices", dasd_proc_root_entry);
 330  out_nodevices:
 331         remove_proc_entry("dasd", NULL);
 332  out_nodasd:
 333         return -ENOENT;
 334 }
 335
 336 void
 337 dasd_proc_exit(void)
 338 {
 339         remove_proc_entry("devices", dasd_proc_root_entry);
 340         remove_proc_entry("statistics", dasd_proc_root_entry);
 341         remove_proc_entry("dasd", NULL);
 342 }