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 #ifdef CONFIG_DASD_PROFILE 32 static 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 #endif /* CONFIG_DASD_PROFILE */ 52 53 static int 54 dasd_devices_show(struct seq_file *m, void *v) 55 { 56 struct dasd_device *device; 57 struct dasd_block *block; 58 char *substr; 59 60 device = dasd_device_from_devindex((unsigned long) v - 1); 61 if (IS_ERR(device)) 62 return 0; 63 if (device->block) 64 block = device->block; 65 else 66 return 0; 67 /* Print device number. */ 68 seq_printf(m, "%s", device->cdev->dev.bus_id); 69 /* Print discipline string. */ 70 if (device != NULL && device->discipline != NULL) 71 seq_printf(m, "(%s)", device->discipline->name); 72 else 73 seq_printf(m, "(none)"); 74 /* Print kdev. */ 75 if (block->gdp) 76 seq_printf(m, " at (%3d:%6d)", 77 block->gdp->major, block->gdp->first_minor); 78 else 79 seq_printf(m, " at (???:??????)"); 80 /* Print device name. */ 81 if (block->gdp) 82 seq_printf(m, " is %-8s", block->gdp->disk_name); 83 else 84 seq_printf(m, " is ????????"); 85 /* Print devices features. */ 86 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 87 seq_printf(m, "%4s: ", substr); 88 /* Print device status information. */ 89 switch ((device != NULL) ? device->state : -1) { 90 case -1: 91 seq_printf(m, "unknown"); 92 break; 93 case DASD_STATE_NEW: 94 seq_printf(m, "new"); 95 break; 96 case DASD_STATE_KNOWN: 97 seq_printf(m, "detected"); 98 break; 99 case DASD_STATE_BASIC: 100 seq_printf(m, "basic"); 101 break; 102 case DASD_STATE_UNFMT: 103 seq_printf(m, "unformatted"); 104 break; 105 case DASD_STATE_READY: 106 case DASD_STATE_ONLINE: 107 seq_printf(m, "active "); 108 if (dasd_check_blocksize(block->bp_block)) 109 seq_printf(m, "n/f "); 110 else 111 seq_printf(m, 112 "at blocksize: %d, %ld blocks, %ld MB", 113 block->bp_block, block->blocks, 114 ((block->bp_block >> 9) * 115 block->blocks) >> 11); 116 break; 117 default: 118 seq_printf(m, "no stat"); 119 break; 120 } 121 dasd_put_device(device); 122 if (dasd_probeonly) 123 seq_printf(m, "(probeonly)"); 124 seq_printf(m, "\n"); 125 return 0; 126 } 127 128 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 129 { 130 if (*pos >= dasd_max_devindex) 131 return NULL; 132 return (void *)((unsigned long) *pos + 1); 133 } 134 135 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 136 { 137 ++*pos; 138 return dasd_devices_start(m, pos); 139 } 140 141 static void dasd_devices_stop(struct seq_file *m, void *v) 142 { 143 } 144 145 static const struct seq_operations dasd_devices_seq_ops = { 146 .start = dasd_devices_start, 147 .next = dasd_devices_next, 148 .stop = dasd_devices_stop, 149 .show = dasd_devices_show, 150 }; 151 152 static int dasd_devices_open(struct inode *inode, struct file *file) 153 { 154 return seq_open(file, &dasd_devices_seq_ops); 155 } 156 157 static const struct file_operations dasd_devices_file_ops = { 158 .open = dasd_devices_open, 159 .read = seq_read, 160 .llseek = seq_lseek, 161 .release = seq_release, 162 }; 163 164 static int 165 dasd_calc_metrics(char *page, char **start, off_t off, 166 int count, int *eof, int len) 167 { 168 len = (len > off) ? len - off : 0; 169 if (len > count) 170 len = count; 171 if (len < count) 172 *eof = 1; 173 *start = page + off; 174 return len; 175 } 176 177 #ifdef CONFIG_DASD_PROFILE 178 static char * 179 dasd_statistics_array(char *str, unsigned int *array, int shift) 180 { 181 int i; 182 183 for (i = 0; i < 32; i++) { 184 str += sprintf(str, "%7d ", array[i] >> shift); 185 if (i == 15) 186 str += sprintf(str, "\n"); 187 } 188 str += sprintf(str,"\n"); 189 return str; 190 } 191 #endif /* CONFIG_DASD_PROFILE */ 192 193 static int 194 dasd_statistics_read(char *page, char **start, off_t off, 195 int count, int *eof, void *data) 196 { 197 unsigned long len; 198 #ifdef CONFIG_DASD_PROFILE 199 struct dasd_profile_info_t *prof; 200 char *str; 201 int shift; 202 203 /* check for active profiling */ 204 if (dasd_profile_level == DASD_PROFILE_OFF) { 205 len = sprintf(page, "Statistics are off - they might be " 206 "switched on using 'echo set on > " 207 "/proc/dasd/statistics'\n"); 208 return dasd_calc_metrics(page, start, off, count, eof, len); 209 } 210 211 prof = &dasd_global_profile; 212 /* prevent couter 'overflow' on output */ 213 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 214 215 str = page; 216 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 217 str += sprintf(str, "with %d sectors(512B each)\n", 218 prof->dasd_io_sects); 219 str += sprintf(str, 220 " __<4 ___8 __16 __32 __64 _128 " 221 " _256 _512 __1k __2k __4k __8k " 222 " _16k _32k _64k 128k\n"); 223 str += sprintf(str, 224 " _256 _512 __1M __2M __4M __8M " 225 " _16M _32M _64M 128M 256M 512M " 226 " __1G __2G __4G " " _>4G\n"); 227 228 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 229 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 230 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 231 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 232 str += sprintf(str, "Histogram of I/O times per sector\n"); 233 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 234 str += sprintf(str, "Histogram of I/O time till ssch\n"); 235 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 236 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 237 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 238 str += sprintf(str, "Histogram of I/O time between ssch " 239 "and irq per sector\n"); 240 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 241 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 242 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 243 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 244 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 245 len = str - page; 246 #else 247 len = sprintf(page, "Statistics are not activated in this kernel\n"); 248 #endif 249 return dasd_calc_metrics(page, start, off, count, eof, len); 250 } 251 252 static int 253 dasd_statistics_write(struct file *file, const char __user *user_buf, 254 unsigned long user_len, void *data) 255 { 256 #ifdef CONFIG_DASD_PROFILE 257 char *buffer, *str; 258 259 if (user_len > 65536) 260 user_len = 65536; 261 buffer = dasd_get_user_string(user_buf, user_len); 262 if (IS_ERR(buffer)) 263 return PTR_ERR(buffer); 264 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 265 266 /* check for valid verbs */ 267 for (str = buffer; isspace(*str); str++); 268 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 269 /* 'set xxx' was given */ 270 for (str = str + 4; isspace(*str); str++); 271 if (strcmp(str, "on") == 0) { 272 /* switch on statistics profiling */ 273 dasd_profile_level = DASD_PROFILE_ON; 274 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 275 } else if (strcmp(str, "off") == 0) { 276 /* switch off and reset statistics profiling */ 277 memset(&dasd_global_profile, 278 0, sizeof (struct dasd_profile_info_t)); 279 dasd_profile_level = DASD_PROFILE_OFF; 280 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 281 } else 282 goto out_error; 283 } else if (strncmp(str, "reset", 5) == 0) { 284 /* reset the statistics */ 285 memset(&dasd_global_profile, 0, 286 sizeof (struct dasd_profile_info_t)); 287 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 288 } else 289 goto out_error; 290 kfree(buffer); 291 return user_len; 292 out_error: 293 MESSAGE(KERN_WARNING, "%s", 294 "/proc/dasd/statistics: only 'set on', 'set off' " 295 "and 'reset' are supported verbs"); 296 kfree(buffer); 297 return -EINVAL; 298 #else 299 MESSAGE(KERN_WARNING, "%s", 300 "/proc/dasd/statistics: is not activated in this kernel"); 301 return user_len; 302 #endif /* CONFIG_DASD_PROFILE */ 303 } 304 305 /* 306 * Create dasd proc-fs entries. 307 * In case creation failed, cleanup and return -ENOENT. 308 */ 309 int 310 dasd_proc_init(void) 311 { 312 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 313 if (!dasd_proc_root_entry) 314 goto out_nodasd; 315 dasd_proc_root_entry->owner = THIS_MODULE; 316 dasd_devices_entry = create_proc_entry("devices", 317 S_IFREG | S_IRUGO | S_IWUSR, 318 dasd_proc_root_entry); 319 if (!dasd_devices_entry) 320 goto out_nodevices; 321 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 322 dasd_devices_entry->owner = THIS_MODULE; 323 dasd_statistics_entry = create_proc_entry("statistics", 324 S_IFREG | S_IRUGO | S_IWUSR, 325 dasd_proc_root_entry); 326 if (!dasd_statistics_entry) 327 goto out_nostatistics; 328 dasd_statistics_entry->read_proc = dasd_statistics_read; 329 dasd_statistics_entry->write_proc = dasd_statistics_write; 330 dasd_statistics_entry->owner = THIS_MODULE; 331 return 0; 332 333 out_nostatistics: 334 remove_proc_entry("devices", dasd_proc_root_entry); 335 out_nodevices: 336 remove_proc_entry("dasd", &proc_root); 337 out_nodasd: 338 return -ENOENT; 339 } 340 341 void 342 dasd_proc_exit(void) 343 { 344 remove_proc_entry("devices", dasd_proc_root_entry); 345 remove_proc_entry("statistics", dasd_proc_root_entry); 346 remove_proc_entry("dasd", &proc_root); 347 } 348