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->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->state) { 96 case DASD_STATE_NEW: 97 seq_printf(m, "new"); 98 break; 99 case DASD_STATE_KNOWN: 100 seq_printf(m, "detected"); 101 break; 102 case DASD_STATE_BASIC: 103 seq_printf(m, "basic"); 104 break; 105 case DASD_STATE_UNFMT: 106 seq_printf(m, "unformatted"); 107 break; 108 case DASD_STATE_READY: 109 case DASD_STATE_ONLINE: 110 seq_printf(m, "active "); 111 if (dasd_check_blocksize(block->bp_block)) 112 seq_printf(m, "n/f "); 113 else 114 seq_printf(m, 115 "at blocksize: %d, %lld blocks, %lld MB", 116 block->bp_block, block->blocks, 117 ((block->bp_block >> 9) * 118 block->blocks) >> 11); 119 break; 120 default: 121 seq_printf(m, "no stat"); 122 break; 123 } 124 dasd_put_device(device); 125 if (dasd_probeonly) 126 seq_printf(m, "(probeonly)"); 127 seq_printf(m, "\n"); 128 return 0; 129 } 130 131 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 132 { 133 if (*pos >= dasd_max_devindex) 134 return NULL; 135 return (void *)((unsigned long) *pos + 1); 136 } 137 138 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 139 { 140 ++*pos; 141 return dasd_devices_start(m, pos); 142 } 143 144 static void dasd_devices_stop(struct seq_file *m, void *v) 145 { 146 } 147 148 static const struct seq_operations dasd_devices_seq_ops = { 149 .start = dasd_devices_start, 150 .next = dasd_devices_next, 151 .stop = dasd_devices_stop, 152 .show = dasd_devices_show, 153 }; 154 155 static int dasd_devices_open(struct inode *inode, struct file *file) 156 { 157 return seq_open(file, &dasd_devices_seq_ops); 158 } 159 160 static const struct file_operations dasd_devices_file_ops = { 161 .owner = THIS_MODULE, 162 .open = dasd_devices_open, 163 .read = seq_read, 164 .llseek = seq_lseek, 165 .release = seq_release, 166 }; 167 168 static int 169 dasd_calc_metrics(char *page, char **start, off_t off, 170 int count, int *eof, int len) 171 { 172 len = (len > off) ? len - off : 0; 173 if (len > count) 174 len = count; 175 if (len < count) 176 *eof = 1; 177 *start = page + off; 178 return len; 179 } 180 181 #ifdef CONFIG_DASD_PROFILE 182 static char * 183 dasd_statistics_array(char *str, unsigned int *array, int factor) 184 { 185 int i; 186 187 for (i = 0; i < 32; i++) { 188 str += sprintf(str, "%7d ", array[i] / factor); 189 if (i == 15) 190 str += sprintf(str, "\n"); 191 } 192 str += sprintf(str,"\n"); 193 return str; 194 } 195 #endif /* CONFIG_DASD_PROFILE */ 196 197 static int 198 dasd_statistics_read(char *page, char **start, off_t off, 199 int count, int *eof, void *data) 200 { 201 unsigned long len; 202 #ifdef CONFIG_DASD_PROFILE 203 struct dasd_profile_info_t *prof; 204 char *str; 205 int factor; 206 207 /* check for active profiling */ 208 if (dasd_profile_level == DASD_PROFILE_OFF) { 209 len = sprintf(page, "Statistics are off - they might be " 210 "switched on using 'echo set on > " 211 "/proc/dasd/statistics'\n"); 212 return dasd_calc_metrics(page, start, off, count, eof, len); 213 } 214 215 prof = &dasd_global_profile; 216 /* prevent counter 'overflow' on output */ 217 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; 218 factor *= 10); 219 220 str = page; 221 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 222 str += sprintf(str, "with %u sectors(512B each)\n", 223 prof->dasd_io_sects); 224 str += sprintf(str, "Scale Factor is %d\n", factor); 225 str += sprintf(str, 226 " __<4 ___8 __16 __32 __64 _128 " 227 " _256 _512 __1k __2k __4k __8k " 228 " _16k _32k _64k 128k\n"); 229 str += sprintf(str, 230 " _256 _512 __1M __2M __4M __8M " 231 " _16M _32M _64M 128M 256M 512M " 232 " __1G __2G __4G " " _>4G\n"); 233 234 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 235 str = dasd_statistics_array(str, prof->dasd_io_secs, factor); 236 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 237 str = dasd_statistics_array(str, prof->dasd_io_times, factor); 238 str += sprintf(str, "Histogram of I/O times per sector\n"); 239 str = dasd_statistics_array(str, prof->dasd_io_timps, factor); 240 str += sprintf(str, "Histogram of I/O time till ssch\n"); 241 str = dasd_statistics_array(str, prof->dasd_io_time1, factor); 242 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 243 str = dasd_statistics_array(str, prof->dasd_io_time2, factor); 244 str += sprintf(str, "Histogram of I/O time between ssch " 245 "and irq per sector\n"); 246 str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor); 247 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 248 str = dasd_statistics_array(str, prof->dasd_io_time3, factor); 249 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 250 str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor); 251 len = str - page; 252 #else 253 len = sprintf(page, "Statistics are not activated in this kernel\n"); 254 #endif 255 return dasd_calc_metrics(page, start, off, count, eof, len); 256 } 257 258 static int 259 dasd_statistics_write(struct file *file, const char __user *user_buf, 260 unsigned long user_len, void *data) 261 { 262 #ifdef CONFIG_DASD_PROFILE 263 char *buffer, *str; 264 265 if (user_len > 65536) 266 user_len = 65536; 267 buffer = dasd_get_user_string(user_buf, user_len); 268 if (IS_ERR(buffer)) 269 return PTR_ERR(buffer); 270 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer); 271 272 /* check for valid verbs */ 273 str = skip_spaces(buffer); 274 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 275 /* 'set xxx' was given */ 276 str = skip_spaces(str + 4); 277 if (strcmp(str, "on") == 0) { 278 /* switch on statistics profiling */ 279 dasd_profile_level = DASD_PROFILE_ON; 280 pr_info("The statistics feature has been switched " 281 "on\n"); 282 } else if (strcmp(str, "off") == 0) { 283 /* switch off and reset statistics profiling */ 284 memset(&dasd_global_profile, 285 0, sizeof (struct dasd_profile_info_t)); 286 dasd_profile_level = DASD_PROFILE_OFF; 287 pr_info("The statistics feature has been switched " 288 "off\n"); 289 } else 290 goto out_error; 291 } else if (strncmp(str, "reset", 5) == 0) { 292 /* reset the statistics */ 293 memset(&dasd_global_profile, 0, 294 sizeof (struct dasd_profile_info_t)); 295 pr_info("The statistics have been reset\n"); 296 } else 297 goto out_error; 298 kfree(buffer); 299 return user_len; 300 out_error: 301 pr_warning("%s is not a supported value for /proc/dasd/statistics\n", 302 str); 303 kfree(buffer); 304 return -EINVAL; 305 #else 306 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n"); 307 return user_len; 308 #endif /* CONFIG_DASD_PROFILE */ 309 } 310 311 /* 312 * Create dasd proc-fs entries. 313 * In case creation failed, cleanup and return -ENOENT. 314 */ 315 int 316 dasd_proc_init(void) 317 { 318 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 319 if (!dasd_proc_root_entry) 320 goto out_nodasd; 321 dasd_devices_entry = proc_create("devices", 322 S_IFREG | S_IRUGO | S_IWUSR, 323 dasd_proc_root_entry, 324 &dasd_devices_file_ops); 325 if (!dasd_devices_entry) 326 goto out_nodevices; 327 dasd_statistics_entry = create_proc_entry("statistics", 328 S_IFREG | S_IRUGO | S_IWUSR, 329 dasd_proc_root_entry); 330 if (!dasd_statistics_entry) 331 goto out_nostatistics; 332 dasd_statistics_entry->read_proc = dasd_statistics_read; 333 dasd_statistics_entry->write_proc = dasd_statistics_write; 334 return 0; 335 336 out_nostatistics: 337 remove_proc_entry("devices", dasd_proc_root_entry); 338 out_nodevices: 339 remove_proc_entry("dasd", NULL); 340 out_nodasd: 341 return -ENOENT; 342 } 343 344 void 345 dasd_proc_exit(void) 346 { 347 remove_proc_entry("devices", dasd_proc_root_entry); 348 remove_proc_entry("statistics", dasd_proc_root_entry); 349 remove_proc_entry("dasd", NULL); 350 } 351