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", device->cdev->dev.bus_id); 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 block->gdp->major, block->gdp->first_minor); 80 else 81 seq_printf(m, " at (???:??????)"); 82 /* Print device name. */ 83 if (block->gdp) 84 seq_printf(m, " is %-8s", block->gdp->disk_name); 85 else 86 seq_printf(m, " is ????????"); 87 /* Print devices features. */ 88 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 89 seq_printf(m, "%4s: ", substr); 90 /* Print device status information. */ 91 switch ((device != NULL) ? device->state : -1) { 92 case -1: 93 seq_printf(m, "unknown"); 94 break; 95 case DASD_STATE_NEW: 96 seq_printf(m, "new"); 97 break; 98 case DASD_STATE_KNOWN: 99 seq_printf(m, "detected"); 100 break; 101 case DASD_STATE_BASIC: 102 seq_printf(m, "basic"); 103 break; 104 case DASD_STATE_UNFMT: 105 seq_printf(m, "unformatted"); 106 break; 107 case DASD_STATE_READY: 108 case DASD_STATE_ONLINE: 109 seq_printf(m, "active "); 110 if (dasd_check_blocksize(block->bp_block)) 111 seq_printf(m, "n/f "); 112 else 113 seq_printf(m, 114 "at blocksize: %d, %ld blocks, %ld MB", 115 block->bp_block, block->blocks, 116 ((block->bp_block >> 9) * 117 block->blocks) >> 11); 118 break; 119 default: 120 seq_printf(m, "no stat"); 121 break; 122 } 123 dasd_put_device(device); 124 if (dasd_probeonly) 125 seq_printf(m, "(probeonly)"); 126 seq_printf(m, "\n"); 127 return 0; 128 } 129 130 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 131 { 132 if (*pos >= dasd_max_devindex) 133 return NULL; 134 return (void *)((unsigned long) *pos + 1); 135 } 136 137 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 138 { 139 ++*pos; 140 return dasd_devices_start(m, pos); 141 } 142 143 static void dasd_devices_stop(struct seq_file *m, void *v) 144 { 145 } 146 147 static const struct seq_operations dasd_devices_seq_ops = { 148 .start = dasd_devices_start, 149 .next = dasd_devices_next, 150 .stop = dasd_devices_stop, 151 .show = dasd_devices_show, 152 }; 153 154 static int dasd_devices_open(struct inode *inode, struct file *file) 155 { 156 return seq_open(file, &dasd_devices_seq_ops); 157 } 158 159 static const struct file_operations dasd_devices_file_ops = { 160 .owner = THIS_MODULE, 161 .open = dasd_devices_open, 162 .read = seq_read, 163 .llseek = seq_lseek, 164 .release = seq_release, 165 }; 166 167 static int 168 dasd_calc_metrics(char *page, char **start, off_t off, 169 int count, int *eof, int len) 170 { 171 len = (len > off) ? len - off : 0; 172 if (len > count) 173 len = count; 174 if (len < count) 175 *eof = 1; 176 *start = page + off; 177 return len; 178 } 179 180 #ifdef CONFIG_DASD_PROFILE 181 static char * 182 dasd_statistics_array(char *str, unsigned int *array, int shift) 183 { 184 int i; 185 186 for (i = 0; i < 32; i++) { 187 str += sprintf(str, "%7d ", array[i] >> shift); 188 if (i == 15) 189 str += sprintf(str, "\n"); 190 } 191 str += sprintf(str,"\n"); 192 return str; 193 } 194 #endif /* CONFIG_DASD_PROFILE */ 195 196 static int 197 dasd_statistics_read(char *page, char **start, off_t off, 198 int count, int *eof, void *data) 199 { 200 unsigned long len; 201 #ifdef CONFIG_DASD_PROFILE 202 struct dasd_profile_info_t *prof; 203 char *str; 204 int shift; 205 206 /* check for active profiling */ 207 if (dasd_profile_level == DASD_PROFILE_OFF) { 208 len = sprintf(page, "Statistics are off - they might be " 209 "switched on using 'echo set on > " 210 "/proc/dasd/statistics'\n"); 211 return dasd_calc_metrics(page, start, off, count, eof, len); 212 } 213 214 prof = &dasd_global_profile; 215 /* prevent couter 'overflow' on output */ 216 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 217 218 str = page; 219 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 220 str += sprintf(str, "with %d sectors(512B each)\n", 221 prof->dasd_io_sects); 222 str += sprintf(str, 223 " __<4 ___8 __16 __32 __64 _128 " 224 " _256 _512 __1k __2k __4k __8k " 225 " _16k _32k _64k 128k\n"); 226 str += sprintf(str, 227 " _256 _512 __1M __2M __4M __8M " 228 " _16M _32M _64M 128M 256M 512M " 229 " __1G __2G __4G " " _>4G\n"); 230 231 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 232 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 233 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 234 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 235 str += sprintf(str, "Histogram of I/O times per sector\n"); 236 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 237 str += sprintf(str, "Histogram of I/O time till ssch\n"); 238 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 239 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 240 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 241 str += sprintf(str, "Histogram of I/O time between ssch " 242 "and irq per sector\n"); 243 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 244 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 245 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 246 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 247 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 248 len = str - page; 249 #else 250 len = sprintf(page, "Statistics are not activated in this kernel\n"); 251 #endif 252 return dasd_calc_metrics(page, start, off, count, eof, len); 253 } 254 255 static int 256 dasd_statistics_write(struct file *file, const char __user *user_buf, 257 unsigned long user_len, void *data) 258 { 259 #ifdef CONFIG_DASD_PROFILE 260 char *buffer, *str; 261 262 if (user_len > 65536) 263 user_len = 65536; 264 buffer = dasd_get_user_string(user_buf, user_len); 265 if (IS_ERR(buffer)) 266 return PTR_ERR(buffer); 267 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 268 269 /* check for valid verbs */ 270 for (str = buffer; isspace(*str); str++); 271 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 272 /* 'set xxx' was given */ 273 for (str = str + 4; isspace(*str); str++); 274 if (strcmp(str, "on") == 0) { 275 /* switch on statistics profiling */ 276 dasd_profile_level = DASD_PROFILE_ON; 277 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 278 } else if (strcmp(str, "off") == 0) { 279 /* switch off and reset statistics profiling */ 280 memset(&dasd_global_profile, 281 0, sizeof (struct dasd_profile_info_t)); 282 dasd_profile_level = DASD_PROFILE_OFF; 283 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 284 } else 285 goto out_error; 286 } else if (strncmp(str, "reset", 5) == 0) { 287 /* reset the statistics */ 288 memset(&dasd_global_profile, 0, 289 sizeof (struct dasd_profile_info_t)); 290 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 291 } else 292 goto out_error; 293 kfree(buffer); 294 return user_len; 295 out_error: 296 MESSAGE(KERN_WARNING, "%s", 297 "/proc/dasd/statistics: only 'set on', 'set off' " 298 "and 'reset' are supported verbs"); 299 kfree(buffer); 300 return -EINVAL; 301 #else 302 MESSAGE(KERN_WARNING, "%s", 303 "/proc/dasd/statistics: is not activated in this kernel"); 304 return user_len; 305 #endif /* CONFIG_DASD_PROFILE */ 306 } 307 308 /* 309 * Create dasd proc-fs entries. 310 * In case creation failed, cleanup and return -ENOENT. 311 */ 312 int 313 dasd_proc_init(void) 314 { 315 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 316 if (!dasd_proc_root_entry) 317 goto out_nodasd; 318 dasd_proc_root_entry->owner = THIS_MODULE; 319 dasd_devices_entry = proc_create("devices", 320 S_IFREG | S_IRUGO | S_IWUSR, 321 dasd_proc_root_entry, 322 &dasd_devices_file_ops); 323 if (!dasd_devices_entry) 324 goto out_nodevices; 325 dasd_statistics_entry = create_proc_entry("statistics", 326 S_IFREG | S_IRUGO | S_IWUSR, 327 dasd_proc_root_entry); 328 if (!dasd_statistics_entry) 329 goto out_nostatistics; 330 dasd_statistics_entry->read_proc = dasd_statistics_read; 331 dasd_statistics_entry->write_proc = dasd_statistics_write; 332 dasd_statistics_entry->owner = THIS_MODULE; 333 return 0; 334 335 out_nostatistics: 336 remove_proc_entry("devices", dasd_proc_root_entry); 337 out_nodevices: 338 remove_proc_entry("dasd", NULL); 339 out_nodasd: 340 return -ENOENT; 341 } 342 343 void 344 dasd_proc_exit(void) 345 { 346 remove_proc_entry("devices", dasd_proc_root_entry); 347 remove_proc_entry("statistics", dasd_proc_root_entry); 348 remove_proc_entry("dasd", NULL); 349 } 350