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