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 #define KMSG_COMPONENT "dasd" 15 16 #include <linux/ctype.h> 17 #include <linux/string.h> 18 #include <linux/seq_file.h> 19 #include <linux/vmalloc.h> 20 #include <linux/proc_fs.h> 21 22 #include <asm/debug.h> 23 #include <asm/uaccess.h> 24 25 /* This is ugly... */ 26 #define PRINTK_HEADER "dasd_proc:" 27 28 #include "dasd_int.h" 29 30 static struct proc_dir_entry *dasd_proc_root_entry = NULL; 31 static struct proc_dir_entry *dasd_devices_entry = NULL; 32 static struct proc_dir_entry *dasd_statistics_entry = NULL; 33 34 #ifdef CONFIG_DASD_PROFILE 35 static char * 36 dasd_get_user_string(const char __user *user_buf, size_t user_len) 37 { 38 char *buffer; 39 40 buffer = kmalloc(user_len + 1, GFP_KERNEL); 41 if (buffer == NULL) 42 return ERR_PTR(-ENOMEM); 43 if (copy_from_user(buffer, user_buf, user_len) != 0) { 44 kfree(buffer); 45 return ERR_PTR(-EFAULT); 46 } 47 /* got the string, now strip linefeed. */ 48 if (buffer[user_len - 1] == '\n') 49 buffer[user_len - 1] = 0; 50 else 51 buffer[user_len] = 0; 52 return buffer; 53 } 54 #endif /* CONFIG_DASD_PROFILE */ 55 56 static int 57 dasd_devices_show(struct seq_file *m, void *v) 58 { 59 struct dasd_device *device; 60 struct dasd_block *block; 61 char *substr; 62 63 device = dasd_device_from_devindex((unsigned long) v - 1); 64 if (IS_ERR(device)) 65 return 0; 66 if (device->block) 67 block = device->block; 68 else { 69 dasd_put_device(device); 70 return 0; 71 } 72 /* Print device number. */ 73 seq_printf(m, "%s", dev_name(&device->cdev->dev)); 74 /* Print discipline string. */ 75 if (device != NULL && device->discipline != NULL) 76 seq_printf(m, "(%s)", device->discipline->name); 77 else 78 seq_printf(m, "(none)"); 79 /* Print kdev. */ 80 if (block->gdp) 81 seq_printf(m, " at (%3d:%6d)", 82 MAJOR(disk_devt(block->gdp)), 83 MINOR(disk_devt(block->gdp))); 84 else 85 seq_printf(m, " at (???:??????)"); 86 /* Print device name. */ 87 if (block->gdp) 88 seq_printf(m, " is %-8s", block->gdp->disk_name); 89 else 90 seq_printf(m, " is ????????"); 91 /* Print devices features. */ 92 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 93 seq_printf(m, "%4s: ", substr); 94 /* Print device status information. */ 95 switch ((device != NULL) ? device->state : -1) { 96 case -1: 97 seq_printf(m, "unknown"); 98 break; 99 case DASD_STATE_NEW: 100 seq_printf(m, "new"); 101 break; 102 case DASD_STATE_KNOWN: 103 seq_printf(m, "detected"); 104 break; 105 case DASD_STATE_BASIC: 106 seq_printf(m, "basic"); 107 break; 108 case DASD_STATE_UNFMT: 109 seq_printf(m, "unformatted"); 110 break; 111 case DASD_STATE_READY: 112 case DASD_STATE_ONLINE: 113 seq_printf(m, "active "); 114 if (dasd_check_blocksize(block->bp_block)) 115 seq_printf(m, "n/f "); 116 else 117 seq_printf(m, 118 "at blocksize: %d, %lld blocks, %lld MB", 119 block->bp_block, block->blocks, 120 ((block->bp_block >> 9) * 121 block->blocks) >> 11); 122 break; 123 default: 124 seq_printf(m, "no stat"); 125 break; 126 } 127 dasd_put_device(device); 128 if (dasd_probeonly) 129 seq_printf(m, "(probeonly)"); 130 seq_printf(m, "\n"); 131 return 0; 132 } 133 134 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 135 { 136 if (*pos >= dasd_max_devindex) 137 return NULL; 138 return (void *)((unsigned long) *pos + 1); 139 } 140 141 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 142 { 143 ++*pos; 144 return dasd_devices_start(m, pos); 145 } 146 147 static void dasd_devices_stop(struct seq_file *m, void *v) 148 { 149 } 150 151 static const struct seq_operations dasd_devices_seq_ops = { 152 .start = dasd_devices_start, 153 .next = dasd_devices_next, 154 .stop = dasd_devices_stop, 155 .show = dasd_devices_show, 156 }; 157 158 static int dasd_devices_open(struct inode *inode, struct file *file) 159 { 160 return seq_open(file, &dasd_devices_seq_ops); 161 } 162 163 static const struct file_operations dasd_devices_file_ops = { 164 .owner = THIS_MODULE, 165 .open = dasd_devices_open, 166 .read = seq_read, 167 .llseek = seq_lseek, 168 .release = seq_release, 169 }; 170 171 static int 172 dasd_calc_metrics(char *page, char **start, off_t off, 173 int count, int *eof, int len) 174 { 175 len = (len > off) ? len - off : 0; 176 if (len > count) 177 len = count; 178 if (len < count) 179 *eof = 1; 180 *start = page + off; 181 return len; 182 } 183 184 #ifdef CONFIG_DASD_PROFILE 185 static char * 186 dasd_statistics_array(char *str, unsigned int *array, int factor) 187 { 188 int i; 189 190 for (i = 0; i < 32; i++) { 191 str += sprintf(str, "%7d ", array[i] / factor); 192 if (i == 15) 193 str += sprintf(str, "\n"); 194 } 195 str += sprintf(str,"\n"); 196 return str; 197 } 198 #endif /* CONFIG_DASD_PROFILE */ 199 200 static int 201 dasd_statistics_read(char *page, char **start, off_t off, 202 int count, int *eof, void *data) 203 { 204 unsigned long len; 205 #ifdef CONFIG_DASD_PROFILE 206 struct dasd_profile_info_t *prof; 207 char *str; 208 int factor; 209 210 /* check for active profiling */ 211 if (dasd_profile_level == DASD_PROFILE_OFF) { 212 len = sprintf(page, "Statistics are off - they might be " 213 "switched on using 'echo set on > " 214 "/proc/dasd/statistics'\n"); 215 return dasd_calc_metrics(page, start, off, count, eof, len); 216 } 217 218 prof = &dasd_global_profile; 219 /* prevent counter 'overflow' on output */ 220 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; 221 factor *= 10); 222 223 str = page; 224 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 225 str += sprintf(str, "with %u sectors(512B each)\n", 226 prof->dasd_io_sects); 227 str += sprintf(str, "Scale Factor is %d\n", factor); 228 str += sprintf(str, 229 " __<4 ___8 __16 __32 __64 _128 " 230 " _256 _512 __1k __2k __4k __8k " 231 " _16k _32k _64k 128k\n"); 232 str += sprintf(str, 233 " _256 _512 __1M __2M __4M __8M " 234 " _16M _32M _64M 128M 256M 512M " 235 " __1G __2G __4G " " _>4G\n"); 236 237 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 238 str = dasd_statistics_array(str, prof->dasd_io_secs, factor); 239 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 240 str = dasd_statistics_array(str, prof->dasd_io_times, factor); 241 str += sprintf(str, "Histogram of I/O times per sector\n"); 242 str = dasd_statistics_array(str, prof->dasd_io_timps, factor); 243 str += sprintf(str, "Histogram of I/O time till ssch\n"); 244 str = dasd_statistics_array(str, prof->dasd_io_time1, factor); 245 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 246 str = dasd_statistics_array(str, prof->dasd_io_time2, factor); 247 str += sprintf(str, "Histogram of I/O time between ssch " 248 "and irq per sector\n"); 249 str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor); 250 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 251 str = dasd_statistics_array(str, prof->dasd_io_time3, factor); 252 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 253 str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor); 254 len = str - page; 255 #else 256 len = sprintf(page, "Statistics are not activated in this kernel\n"); 257 #endif 258 return dasd_calc_metrics(page, start, off, count, eof, len); 259 } 260 261 static int 262 dasd_statistics_write(struct file *file, const char __user *user_buf, 263 unsigned long user_len, void *data) 264 { 265 #ifdef CONFIG_DASD_PROFILE 266 char *buffer, *str; 267 268 if (user_len > 65536) 269 user_len = 65536; 270 buffer = dasd_get_user_string(user_buf, user_len); 271 if (IS_ERR(buffer)) 272 return PTR_ERR(buffer); 273 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer); 274 275 /* check for valid verbs */ 276 str = skip_spaces(buffer); 277 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 278 /* 'set xxx' was given */ 279 str = skip_spaces(str + 4); 280 if (strcmp(str, "on") == 0) { 281 /* switch on statistics profiling */ 282 dasd_profile_level = DASD_PROFILE_ON; 283 pr_info("The statistics feature has been switched " 284 "on\n"); 285 } else if (strcmp(str, "off") == 0) { 286 /* switch off and reset statistics profiling */ 287 memset(&dasd_global_profile, 288 0, sizeof (struct dasd_profile_info_t)); 289 dasd_profile_level = DASD_PROFILE_OFF; 290 pr_info("The statistics feature has been switched " 291 "off\n"); 292 } else 293 goto out_error; 294 } else if (strncmp(str, "reset", 5) == 0) { 295 /* reset the statistics */ 296 memset(&dasd_global_profile, 0, 297 sizeof (struct dasd_profile_info_t)); 298 pr_info("The statistics have been reset\n"); 299 } else 300 goto out_error; 301 kfree(buffer); 302 return user_len; 303 out_error: 304 pr_warning("%s is not a supported value for /proc/dasd/statistics\n", 305 str); 306 kfree(buffer); 307 return -EINVAL; 308 #else 309 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n"); 310 return user_len; 311 #endif /* CONFIG_DASD_PROFILE */ 312 } 313 314 /* 315 * Create dasd proc-fs entries. 316 * In case creation failed, cleanup and return -ENOENT. 317 */ 318 int 319 dasd_proc_init(void) 320 { 321 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 322 if (!dasd_proc_root_entry) 323 goto out_nodasd; 324 dasd_devices_entry = proc_create("devices", 325 S_IFREG | S_IRUGO | S_IWUSR, 326 dasd_proc_root_entry, 327 &dasd_devices_file_ops); 328 if (!dasd_devices_entry) 329 goto out_nodevices; 330 dasd_statistics_entry = create_proc_entry("statistics", 331 S_IFREG | S_IRUGO | S_IWUSR, 332 dasd_proc_root_entry); 333 if (!dasd_statistics_entry) 334 goto out_nostatistics; 335 dasd_statistics_entry->read_proc = dasd_statistics_read; 336 dasd_statistics_entry->write_proc = dasd_statistics_write; 337 return 0; 338 339 out_nostatistics: 340 remove_proc_entry("devices", dasd_proc_root_entry); 341 out_nodevices: 342 remove_proc_entry("dasd", NULL); 343 out_nodasd: 344 return -ENOENT; 345 } 346 347 void 348 dasd_proc_exit(void) 349 { 350 remove_proc_entry("devices", dasd_proc_root_entry); 351 remove_proc_entry("statistics", dasd_proc_root_entry); 352 remove_proc_entry("dasd", NULL); 353 } 354