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 dasd_put_device(device); 67 return 0; 68 } 69 /* Print device number. */ 70 seq_printf(m, "%s", dev_name(&device->cdev->dev)); 71 /* Print discipline string. */ 72 if (device != NULL && device->discipline != NULL) 73 seq_printf(m, "(%s)", device->discipline->name); 74 else 75 seq_printf(m, "(none)"); 76 /* Print kdev. */ 77 if (block->gdp) 78 seq_printf(m, " at (%3d:%6d)", 79 MAJOR(disk_devt(block->gdp)), 80 MINOR(disk_devt(block->gdp))); 81 else 82 seq_printf(m, " at (???:??????)"); 83 /* Print device name. */ 84 if (block->gdp) 85 seq_printf(m, " is %-8s", block->gdp->disk_name); 86 else 87 seq_printf(m, " is ????????"); 88 /* Print devices features. */ 89 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 90 seq_printf(m, "%4s: ", substr); 91 /* Print device status information. */ 92 switch ((device != NULL) ? device->state : -1) { 93 case -1: 94 seq_printf(m, "unknown"); 95 break; 96 case DASD_STATE_NEW: 97 seq_printf(m, "new"); 98 break; 99 case DASD_STATE_KNOWN: 100 seq_printf(m, "detected"); 101 break; 102 case DASD_STATE_BASIC: 103 seq_printf(m, "basic"); 104 break; 105 case DASD_STATE_UNFMT: 106 seq_printf(m, "unformatted"); 107 break; 108 case DASD_STATE_READY: 109 case DASD_STATE_ONLINE: 110 seq_printf(m, "active "); 111 if (dasd_check_blocksize(block->bp_block)) 112 seq_printf(m, "n/f "); 113 else 114 seq_printf(m, 115 "at blocksize: %d, %ld blocks, %ld MB", 116 block->bp_block, block->blocks, 117 ((block->bp_block >> 9) * 118 block->blocks) >> 11); 119 break; 120 default: 121 seq_printf(m, "no stat"); 122 break; 123 } 124 dasd_put_device(device); 125 if (dasd_probeonly) 126 seq_printf(m, "(probeonly)"); 127 seq_printf(m, "\n"); 128 return 0; 129 } 130 131 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 132 { 133 if (*pos >= dasd_max_devindex) 134 return NULL; 135 return (void *)((unsigned long) *pos + 1); 136 } 137 138 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 139 { 140 ++*pos; 141 return dasd_devices_start(m, pos); 142 } 143 144 static void dasd_devices_stop(struct seq_file *m, void *v) 145 { 146 } 147 148 static const struct seq_operations dasd_devices_seq_ops = { 149 .start = dasd_devices_start, 150 .next = dasd_devices_next, 151 .stop = dasd_devices_stop, 152 .show = dasd_devices_show, 153 }; 154 155 static int dasd_devices_open(struct inode *inode, struct file *file) 156 { 157 return seq_open(file, &dasd_devices_seq_ops); 158 } 159 160 static const struct file_operations dasd_devices_file_ops = { 161 .owner = THIS_MODULE, 162 .open = dasd_devices_open, 163 .read = seq_read, 164 .llseek = seq_lseek, 165 .release = seq_release, 166 }; 167 168 static int 169 dasd_calc_metrics(char *page, char **start, off_t off, 170 int count, int *eof, int len) 171 { 172 len = (len > off) ? len - off : 0; 173 if (len > count) 174 len = count; 175 if (len < count) 176 *eof = 1; 177 *start = page + off; 178 return len; 179 } 180 181 #ifdef CONFIG_DASD_PROFILE 182 static char * 183 dasd_statistics_array(char *str, unsigned int *array, int shift) 184 { 185 int i; 186 187 for (i = 0; i < 32; i++) { 188 str += sprintf(str, "%7d ", array[i] >> shift); 189 if (i == 15) 190 str += sprintf(str, "\n"); 191 } 192 str += sprintf(str,"\n"); 193 return str; 194 } 195 #endif /* CONFIG_DASD_PROFILE */ 196 197 static int 198 dasd_statistics_read(char *page, char **start, off_t off, 199 int count, int *eof, void *data) 200 { 201 unsigned long len; 202 #ifdef CONFIG_DASD_PROFILE 203 struct dasd_profile_info_t *prof; 204 char *str; 205 int shift; 206 207 /* check for active profiling */ 208 if (dasd_profile_level == DASD_PROFILE_OFF) { 209 len = sprintf(page, "Statistics are off - they might be " 210 "switched on using 'echo set on > " 211 "/proc/dasd/statistics'\n"); 212 return dasd_calc_metrics(page, start, off, count, eof, len); 213 } 214 215 prof = &dasd_global_profile; 216 /* prevent couter 'overflow' on output */ 217 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 218 219 str = page; 220 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 221 str += sprintf(str, "with %d sectors(512B each)\n", 222 prof->dasd_io_sects); 223 str += sprintf(str, 224 " __<4 ___8 __16 __32 __64 _128 " 225 " _256 _512 __1k __2k __4k __8k " 226 " _16k _32k _64k 128k\n"); 227 str += sprintf(str, 228 " _256 _512 __1M __2M __4M __8M " 229 " _16M _32M _64M 128M 256M 512M " 230 " __1G __2G __4G " " _>4G\n"); 231 232 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 233 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 234 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 235 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 236 str += sprintf(str, "Histogram of I/O times per sector\n"); 237 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 238 str += sprintf(str, "Histogram of I/O time till ssch\n"); 239 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 240 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 241 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 242 str += sprintf(str, "Histogram of I/O time between ssch " 243 "and irq per sector\n"); 244 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 245 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 246 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 247 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 248 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 249 len = str - page; 250 #else 251 len = sprintf(page, "Statistics are not activated in this kernel\n"); 252 #endif 253 return dasd_calc_metrics(page, start, off, count, eof, len); 254 } 255 256 static int 257 dasd_statistics_write(struct file *file, const char __user *user_buf, 258 unsigned long user_len, void *data) 259 { 260 #ifdef CONFIG_DASD_PROFILE 261 char *buffer, *str; 262 263 if (user_len > 65536) 264 user_len = 65536; 265 buffer = dasd_get_user_string(user_buf, user_len); 266 if (IS_ERR(buffer)) 267 return PTR_ERR(buffer); 268 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 269 270 /* check for valid verbs */ 271 for (str = buffer; isspace(*str); str++); 272 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 273 /* 'set xxx' was given */ 274 for (str = str + 4; isspace(*str); str++); 275 if (strcmp(str, "on") == 0) { 276 /* switch on statistics profiling */ 277 dasd_profile_level = DASD_PROFILE_ON; 278 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 279 } else if (strcmp(str, "off") == 0) { 280 /* switch off and reset statistics profiling */ 281 memset(&dasd_global_profile, 282 0, sizeof (struct dasd_profile_info_t)); 283 dasd_profile_level = DASD_PROFILE_OFF; 284 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 285 } else 286 goto out_error; 287 } else if (strncmp(str, "reset", 5) == 0) { 288 /* reset the statistics */ 289 memset(&dasd_global_profile, 0, 290 sizeof (struct dasd_profile_info_t)); 291 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 292 } else 293 goto out_error; 294 kfree(buffer); 295 return user_len; 296 out_error: 297 MESSAGE(KERN_WARNING, "%s", 298 "/proc/dasd/statistics: only 'set on', 'set off' " 299 "and 'reset' are supported verbs"); 300 kfree(buffer); 301 return -EINVAL; 302 #else 303 MESSAGE(KERN_WARNING, "%s", 304 "/proc/dasd/statistics: is not activated in this kernel"); 305 return user_len; 306 #endif /* CONFIG_DASD_PROFILE */ 307 } 308 309 /* 310 * Create dasd proc-fs entries. 311 * In case creation failed, cleanup and return -ENOENT. 312 */ 313 int 314 dasd_proc_init(void) 315 { 316 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 317 if (!dasd_proc_root_entry) 318 goto out_nodasd; 319 dasd_proc_root_entry->owner = THIS_MODULE; 320 dasd_devices_entry = proc_create("devices", 321 S_IFREG | S_IRUGO | S_IWUSR, 322 dasd_proc_root_entry, 323 &dasd_devices_file_ops); 324 if (!dasd_devices_entry) 325 goto out_nodevices; 326 dasd_statistics_entry = create_proc_entry("statistics", 327 S_IFREG | S_IRUGO | S_IWUSR, 328 dasd_proc_root_entry); 329 if (!dasd_statistics_entry) 330 goto out_nostatistics; 331 dasd_statistics_entry->read_proc = dasd_statistics_read; 332 dasd_statistics_entry->write_proc = dasd_statistics_write; 333 dasd_statistics_entry->owner = THIS_MODULE; 334 return 0; 335 336 out_nostatistics: 337 remove_proc_entry("devices", dasd_proc_root_entry); 338 out_nodevices: 339 remove_proc_entry("dasd", NULL); 340 out_nodasd: 341 return -ENOENT; 342 } 343 344 void 345 dasd_proc_exit(void) 346 { 347 remove_proc_entry("devices", dasd_proc_root_entry); 348 remove_proc_entry("statistics", dasd_proc_root_entry); 349 remove_proc_entry("dasd", NULL); 350 } 351