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/config.h> 15 #include <linux/ctype.h> 16 #include <linux/seq_file.h> 17 #include <linux/vmalloc.h> 18 #include <linux/proc_fs.h> 19 20 #include <asm/debug.h> 21 #include <asm/uaccess.h> 22 23 /* This is ugly... */ 24 #define PRINTK_HEADER "dasd_proc:" 25 26 #include "dasd_int.h" 27 28 static struct proc_dir_entry *dasd_proc_root_entry = NULL; 29 static struct proc_dir_entry *dasd_devices_entry = NULL; 30 static struct proc_dir_entry *dasd_statistics_entry = NULL; 31 32 static inline 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 52 static int 53 dasd_devices_show(struct seq_file *m, void *v) 54 { 55 struct dasd_device *device; 56 char *substr; 57 58 device = dasd_device_from_devindex((unsigned long) v - 1); 59 if (IS_ERR(device)) 60 return 0; 61 /* Print device number. */ 62 seq_printf(m, "%s", device->cdev->dev.bus_id); 63 /* Print discipline string. */ 64 if (device != NULL && device->discipline != NULL) 65 seq_printf(m, "(%s)", device->discipline->name); 66 else 67 seq_printf(m, "(none)"); 68 /* Print kdev. */ 69 if (device->gdp) 70 seq_printf(m, " at (%3d:%6d)", 71 device->gdp->major, device->gdp->first_minor); 72 else 73 seq_printf(m, " at (???:??????)"); 74 /* Print device name. */ 75 if (device->gdp) 76 seq_printf(m, " is %-8s", device->gdp->disk_name); 77 else 78 seq_printf(m, " is ????????"); 79 /* Print devices features. */ 80 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 81 seq_printf(m, "%4s: ", substr); 82 /* Print device status information. */ 83 switch ((device != NULL) ? device->state : -1) { 84 case -1: 85 seq_printf(m, "unknown"); 86 break; 87 case DASD_STATE_NEW: 88 seq_printf(m, "new"); 89 break; 90 case DASD_STATE_KNOWN: 91 seq_printf(m, "detected"); 92 break; 93 case DASD_STATE_BASIC: 94 seq_printf(m, "basic"); 95 break; 96 case DASD_STATE_UNFMT: 97 seq_printf(m, "unformatted"); 98 break; 99 case DASD_STATE_READY: 100 case DASD_STATE_ONLINE: 101 seq_printf(m, "active "); 102 if (dasd_check_blocksize(device->bp_block)) 103 seq_printf(m, "n/f "); 104 else 105 seq_printf(m, 106 "at blocksize: %d, %ld blocks, %ld MB", 107 device->bp_block, device->blocks, 108 ((device->bp_block >> 9) * 109 device->blocks) >> 11); 110 break; 111 default: 112 seq_printf(m, "no stat"); 113 break; 114 } 115 dasd_put_device(device); 116 if (dasd_probeonly) 117 seq_printf(m, "(probeonly)"); 118 seq_printf(m, "\n"); 119 return 0; 120 } 121 122 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 123 { 124 if (*pos >= dasd_max_devindex) 125 return NULL; 126 return (void *)((unsigned long) *pos + 1); 127 } 128 129 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 130 { 131 ++*pos; 132 return dasd_devices_start(m, pos); 133 } 134 135 static void dasd_devices_stop(struct seq_file *m, void *v) 136 { 137 } 138 139 static struct seq_operations dasd_devices_seq_ops = { 140 .start = dasd_devices_start, 141 .next = dasd_devices_next, 142 .stop = dasd_devices_stop, 143 .show = dasd_devices_show, 144 }; 145 146 static int dasd_devices_open(struct inode *inode, struct file *file) 147 { 148 return seq_open(file, &dasd_devices_seq_ops); 149 } 150 151 static struct file_operations dasd_devices_file_ops = { 152 .open = dasd_devices_open, 153 .read = seq_read, 154 .llseek = seq_lseek, 155 .release = seq_release, 156 }; 157 158 static inline int 159 dasd_calc_metrics(char *page, char **start, off_t off, 160 int count, int *eof, int len) 161 { 162 len = (len > off) ? len - off : 0; 163 if (len > count) 164 len = count; 165 if (len < count) 166 *eof = 1; 167 *start = page + off; 168 return len; 169 } 170 171 static inline char * 172 dasd_statistics_array(char *str, int *array, int shift) 173 { 174 int i; 175 176 for (i = 0; i < 32; i++) { 177 str += sprintf(str, "%7d ", array[i] >> shift); 178 if (i == 15) 179 str += sprintf(str, "\n"); 180 } 181 str += sprintf(str,"\n"); 182 return str; 183 } 184 185 static int 186 dasd_statistics_read(char *page, char **start, off_t off, 187 int count, int *eof, void *data) 188 { 189 unsigned long len; 190 #ifdef CONFIG_DASD_PROFILE 191 struct dasd_profile_info_t *prof; 192 char *str; 193 int shift; 194 195 /* check for active profiling */ 196 if (dasd_profile_level == DASD_PROFILE_OFF) { 197 len = sprintf(page, "Statistics are off - they might be " 198 "switched on using 'echo set on > " 199 "/proc/dasd/statistics'\n"); 200 return dasd_calc_metrics(page, start, off, count, eof, len); 201 } 202 203 prof = &dasd_global_profile; 204 /* prevent couter 'overflow' on output */ 205 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 206 207 str = page; 208 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 209 str += sprintf(str, "with %d sectors(512B each)\n", 210 prof->dasd_io_sects); 211 str += sprintf(str, 212 " __<4 ___8 __16 __32 __64 _128 " 213 " _256 _512 __1k __2k __4k __8k " 214 " _16k _32k _64k 128k\n"); 215 str += sprintf(str, 216 " _256 _512 __1M __2M __4M __8M " 217 " _16M _32M _64M 128M 256M 512M " 218 " __1G __2G __4G " " _>4G\n"); 219 220 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 221 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 222 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 223 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 224 str += sprintf(str, "Histogram of I/O times per sector\n"); 225 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 226 str += sprintf(str, "Histogram of I/O time till ssch\n"); 227 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 228 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 229 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 230 str += sprintf(str, "Histogram of I/O time between ssch " 231 "and irq per sector\n"); 232 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 233 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 234 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 235 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 236 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 237 len = str - page; 238 #else 239 len = sprintf(page, "Statistics are not activated in this kernel\n"); 240 #endif 241 return dasd_calc_metrics(page, start, off, count, eof, len); 242 } 243 244 static int 245 dasd_statistics_write(struct file *file, const char __user *user_buf, 246 unsigned long user_len, void *data) 247 { 248 #ifdef CONFIG_DASD_PROFILE 249 char *buffer, *str; 250 251 if (user_len > 65536) 252 user_len = 65536; 253 buffer = dasd_get_user_string(user_buf, user_len); 254 if (IS_ERR(buffer)) 255 return PTR_ERR(buffer); 256 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 257 258 /* check for valid verbs */ 259 for (str = buffer; isspace(*str); str++); 260 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 261 /* 'set xxx' was given */ 262 for (str = str + 4; isspace(*str); str++); 263 if (strcmp(str, "on") == 0) { 264 /* switch on statistics profiling */ 265 dasd_profile_level = DASD_PROFILE_ON; 266 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 267 } else if (strcmp(str, "off") == 0) { 268 /* switch off and reset statistics profiling */ 269 memset(&dasd_global_profile, 270 0, sizeof (struct dasd_profile_info_t)); 271 dasd_profile_level = DASD_PROFILE_OFF; 272 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 273 } else 274 goto out_error; 275 } else if (strncmp(str, "reset", 5) == 0) { 276 /* reset the statistics */ 277 memset(&dasd_global_profile, 0, 278 sizeof (struct dasd_profile_info_t)); 279 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 280 } else 281 goto out_error; 282 kfree(buffer); 283 return user_len; 284 out_error: 285 MESSAGE(KERN_WARNING, "%s", 286 "/proc/dasd/statistics: only 'set on', 'set off' " 287 "and 'reset' are supported verbs"); 288 kfree(buffer); 289 return -EINVAL; 290 #else 291 MESSAGE(KERN_WARNING, "%s", 292 "/proc/dasd/statistics: is not activated in this kernel"); 293 return user_len; 294 #endif /* CONFIG_DASD_PROFILE */ 295 } 296 297 /* 298 * Create dasd proc-fs entries. 299 * In case creation failed, cleanup and return -ENOENT. 300 */ 301 int 302 dasd_proc_init(void) 303 { 304 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 305 if (!dasd_proc_root_entry) 306 goto out_nodasd; 307 dasd_proc_root_entry->owner = THIS_MODULE; 308 dasd_devices_entry = create_proc_entry("devices", 309 S_IFREG | S_IRUGO | S_IWUSR, 310 dasd_proc_root_entry); 311 if (!dasd_devices_entry) 312 goto out_nodevices; 313 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 314 dasd_devices_entry->owner = THIS_MODULE; 315 dasd_statistics_entry = create_proc_entry("statistics", 316 S_IFREG | S_IRUGO | S_IWUSR, 317 dasd_proc_root_entry); 318 if (!dasd_statistics_entry) 319 goto out_nostatistics; 320 dasd_statistics_entry->read_proc = dasd_statistics_read; 321 dasd_statistics_entry->write_proc = dasd_statistics_write; 322 dasd_statistics_entry->owner = THIS_MODULE; 323 return 0; 324 325 out_nostatistics: 326 remove_proc_entry("devices", dasd_proc_root_entry); 327 out_nodevices: 328 remove_proc_entry("dasd", &proc_root); 329 out_nodasd: 330 return -ENOENT; 331 } 332 333 void 334 dasd_proc_exit(void) 335 { 336 remove_proc_entry("devices", dasd_proc_root_entry); 337 remove_proc_entry("statistics", dasd_proc_root_entry); 338 remove_proc_entry("dasd", &proc_root); 339 } 340