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 static char * 32 dasd_get_user_string(const char __user *user_buf, size_t user_len) 33 { 34 char *buffer; 35 36 buffer = kmalloc(user_len + 1, GFP_KERNEL); 37 if (buffer == NULL) 38 return ERR_PTR(-ENOMEM); 39 if (copy_from_user(buffer, user_buf, user_len) != 0) { 40 kfree(buffer); 41 return ERR_PTR(-EFAULT); 42 } 43 /* got the string, now strip linefeed. */ 44 if (buffer[user_len - 1] == '\n') 45 buffer[user_len - 1] = 0; 46 else 47 buffer[user_len] = 0; 48 return buffer; 49 } 50 51 static int 52 dasd_devices_show(struct seq_file *m, void *v) 53 { 54 struct dasd_device *device; 55 char *substr; 56 57 device = dasd_device_from_devindex((unsigned long) v - 1); 58 if (IS_ERR(device)) 59 return 0; 60 /* Print device number. */ 61 seq_printf(m, "%s", device->cdev->dev.bus_id); 62 /* Print discipline string. */ 63 if (device != NULL && device->discipline != NULL) 64 seq_printf(m, "(%s)", device->discipline->name); 65 else 66 seq_printf(m, "(none)"); 67 /* Print kdev. */ 68 if (device->gdp) 69 seq_printf(m, " at (%3d:%6d)", 70 device->gdp->major, device->gdp->first_minor); 71 else 72 seq_printf(m, " at (???:??????)"); 73 /* Print device name. */ 74 if (device->gdp) 75 seq_printf(m, " is %-8s", device->gdp->disk_name); 76 else 77 seq_printf(m, " is ????????"); 78 /* Print devices features. */ 79 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 80 seq_printf(m, "%4s: ", substr); 81 /* Print device status information. */ 82 switch ((device != NULL) ? device->state : -1) { 83 case -1: 84 seq_printf(m, "unknown"); 85 break; 86 case DASD_STATE_NEW: 87 seq_printf(m, "new"); 88 break; 89 case DASD_STATE_KNOWN: 90 seq_printf(m, "detected"); 91 break; 92 case DASD_STATE_BASIC: 93 seq_printf(m, "basic"); 94 break; 95 case DASD_STATE_UNFMT: 96 seq_printf(m, "unformatted"); 97 break; 98 case DASD_STATE_READY: 99 case DASD_STATE_ONLINE: 100 seq_printf(m, "active "); 101 if (dasd_check_blocksize(device->bp_block)) 102 seq_printf(m, "n/f "); 103 else 104 seq_printf(m, 105 "at blocksize: %d, %ld blocks, %ld MB", 106 device->bp_block, device->blocks, 107 ((device->bp_block >> 9) * 108 device->blocks) >> 11); 109 break; 110 default: 111 seq_printf(m, "no stat"); 112 break; 113 } 114 dasd_put_device(device); 115 if (dasd_probeonly) 116 seq_printf(m, "(probeonly)"); 117 seq_printf(m, "\n"); 118 return 0; 119 } 120 121 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 122 { 123 if (*pos >= dasd_max_devindex) 124 return NULL; 125 return (void *)((unsigned long) *pos + 1); 126 } 127 128 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 129 { 130 ++*pos; 131 return dasd_devices_start(m, pos); 132 } 133 134 static void dasd_devices_stop(struct seq_file *m, void *v) 135 { 136 } 137 138 static struct seq_operations dasd_devices_seq_ops = { 139 .start = dasd_devices_start, 140 .next = dasd_devices_next, 141 .stop = dasd_devices_stop, 142 .show = dasd_devices_show, 143 }; 144 145 static int dasd_devices_open(struct inode *inode, struct file *file) 146 { 147 return seq_open(file, &dasd_devices_seq_ops); 148 } 149 150 static const struct file_operations dasd_devices_file_ops = { 151 .open = dasd_devices_open, 152 .read = seq_read, 153 .llseek = seq_lseek, 154 .release = seq_release, 155 }; 156 157 static int 158 dasd_calc_metrics(char *page, char **start, off_t off, 159 int count, int *eof, int len) 160 { 161 len = (len > off) ? len - off : 0; 162 if (len > count) 163 len = count; 164 if (len < count) 165 *eof = 1; 166 *start = page + off; 167 return len; 168 } 169 170 static char * 171 dasd_statistics_array(char *str, unsigned int *array, int shift) 172 { 173 int i; 174 175 for (i = 0; i < 32; i++) { 176 str += sprintf(str, "%7d ", array[i] >> shift); 177 if (i == 15) 178 str += sprintf(str, "\n"); 179 } 180 str += sprintf(str,"\n"); 181 return str; 182 } 183 184 static int 185 dasd_statistics_read(char *page, char **start, off_t off, 186 int count, int *eof, void *data) 187 { 188 unsigned long len; 189 #ifdef CONFIG_DASD_PROFILE 190 struct dasd_profile_info_t *prof; 191 char *str; 192 int shift; 193 194 /* check for active profiling */ 195 if (dasd_profile_level == DASD_PROFILE_OFF) { 196 len = sprintf(page, "Statistics are off - they might be " 197 "switched on using 'echo set on > " 198 "/proc/dasd/statistics'\n"); 199 return dasd_calc_metrics(page, start, off, count, eof, len); 200 } 201 202 prof = &dasd_global_profile; 203 /* prevent couter 'overflow' on output */ 204 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 205 206 str = page; 207 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 208 str += sprintf(str, "with %d sectors(512B each)\n", 209 prof->dasd_io_sects); 210 str += sprintf(str, 211 " __<4 ___8 __16 __32 __64 _128 " 212 " _256 _512 __1k __2k __4k __8k " 213 " _16k _32k _64k 128k\n"); 214 str += sprintf(str, 215 " _256 _512 __1M __2M __4M __8M " 216 " _16M _32M _64M 128M 256M 512M " 217 " __1G __2G __4G " " _>4G\n"); 218 219 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 220 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 221 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 222 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 223 str += sprintf(str, "Histogram of I/O times per sector\n"); 224 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 225 str += sprintf(str, "Histogram of I/O time till ssch\n"); 226 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 227 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 228 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 229 str += sprintf(str, "Histogram of I/O time between ssch " 230 "and irq per sector\n"); 231 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 232 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 233 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 234 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 235 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 236 len = str - page; 237 #else 238 len = sprintf(page, "Statistics are not activated in this kernel\n"); 239 #endif 240 return dasd_calc_metrics(page, start, off, count, eof, len); 241 } 242 243 static int 244 dasd_statistics_write(struct file *file, const char __user *user_buf, 245 unsigned long user_len, void *data) 246 { 247 #ifdef CONFIG_DASD_PROFILE 248 char *buffer, *str; 249 250 if (user_len > 65536) 251 user_len = 65536; 252 buffer = dasd_get_user_string(user_buf, user_len); 253 if (IS_ERR(buffer)) 254 return PTR_ERR(buffer); 255 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 256 257 /* check for valid verbs */ 258 for (str = buffer; isspace(*str); str++); 259 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 260 /* 'set xxx' was given */ 261 for (str = str + 4; isspace(*str); str++); 262 if (strcmp(str, "on") == 0) { 263 /* switch on statistics profiling */ 264 dasd_profile_level = DASD_PROFILE_ON; 265 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 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 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 272 } else 273 goto out_error; 274 } else if (strncmp(str, "reset", 5) == 0) { 275 /* reset the statistics */ 276 memset(&dasd_global_profile, 0, 277 sizeof (struct dasd_profile_info_t)); 278 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 279 } else 280 goto out_error; 281 kfree(buffer); 282 return user_len; 283 out_error: 284 MESSAGE(KERN_WARNING, "%s", 285 "/proc/dasd/statistics: only 'set on', 'set off' " 286 "and 'reset' are supported verbs"); 287 kfree(buffer); 288 return -EINVAL; 289 #else 290 MESSAGE(KERN_WARNING, "%s", 291 "/proc/dasd/statistics: is not activated in this kernel"); 292 return user_len; 293 #endif /* CONFIG_DASD_PROFILE */ 294 } 295 296 /* 297 * Create dasd proc-fs entries. 298 * In case creation failed, cleanup and return -ENOENT. 299 */ 300 int 301 dasd_proc_init(void) 302 { 303 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 304 if (!dasd_proc_root_entry) 305 goto out_nodasd; 306 dasd_proc_root_entry->owner = THIS_MODULE; 307 dasd_devices_entry = create_proc_entry("devices", 308 S_IFREG | S_IRUGO | S_IWUSR, 309 dasd_proc_root_entry); 310 if (!dasd_devices_entry) 311 goto out_nodevices; 312 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 313 dasd_devices_entry->owner = THIS_MODULE; 314 dasd_statistics_entry = create_proc_entry("statistics", 315 S_IFREG | S_IRUGO | S_IWUSR, 316 dasd_proc_root_entry); 317 if (!dasd_statistics_entry) 318 goto out_nostatistics; 319 dasd_statistics_entry->read_proc = dasd_statistics_read; 320 dasd_statistics_entry->write_proc = dasd_statistics_write; 321 dasd_statistics_entry->owner = THIS_MODULE; 322 return 0; 323 324 out_nostatistics: 325 remove_proc_entry("devices", dasd_proc_root_entry); 326 out_nodevices: 327 remove_proc_entry("dasd", &proc_root); 328 out_nodasd: 329 return -ENOENT; 330 } 331 332 void 333 dasd_proc_exit(void) 334 { 335 remove_proc_entry("devices", dasd_proc_root_entry); 336 remove_proc_entry("statistics", dasd_proc_root_entry); 337 remove_proc_entry("dasd", &proc_root); 338 } 339