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 * $Revision: 1.31 $ 13 */ 14 15 #include <linux/config.h> 16 #include <linux/ctype.h> 17 #include <linux/seq_file.h> 18 #include <linux/vmalloc.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 int feature; 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 feature = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY); 82 if (feature < 0) 83 return 0; 84 substr = feature ? "(ro)" : " "; 85 seq_printf(m, "%4s: ", substr); 86 /* Print device status information. */ 87 switch ((device != NULL) ? device->state : -1) { 88 case -1: 89 seq_printf(m, "unknown"); 90 break; 91 case DASD_STATE_NEW: 92 seq_printf(m, "new"); 93 break; 94 case DASD_STATE_KNOWN: 95 seq_printf(m, "detected"); 96 break; 97 case DASD_STATE_BASIC: 98 seq_printf(m, "basic"); 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 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 inline 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 static inline char * 173 dasd_statistics_array(char *str, int *array, int shift) 174 { 175 int i; 176 177 for (i = 0; i < 32; i++) { 178 str += sprintf(str, "%7d ", array[i] >> shift); 179 if (i == 15) 180 str += sprintf(str, "\n"); 181 } 182 str += sprintf(str,"\n"); 183 return str; 184 } 185 186 static int 187 dasd_statistics_read(char *page, char **start, off_t off, 188 int count, int *eof, void *data) 189 { 190 unsigned long len; 191 #ifdef CONFIG_DASD_PROFILE 192 struct dasd_profile_info_t *prof; 193 char *str; 194 int shift; 195 196 /* check for active profiling */ 197 if (dasd_profile_level == DASD_PROFILE_OFF) { 198 len = sprintf(page, "Statistics are off - they might be " 199 "switched on using 'echo set on > " 200 "/proc/dasd/statistics'\n"); 201 return dasd_calc_metrics(page, start, off, count, eof, len); 202 } 203 204 prof = &dasd_global_profile; 205 /* prevent couter 'overflow' on output */ 206 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 207 208 str = page; 209 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 210 str += sprintf(str, "with %d sectors(512B each)\n", 211 prof->dasd_io_sects); 212 str += sprintf(str, 213 " __<4 ___8 __16 __32 __64 _128 " 214 " _256 _512 __1k __2k __4k __8k " 215 " _16k _32k _64k 128k\n"); 216 str += sprintf(str, 217 " _256 _512 __1M __2M __4M __8M " 218 " _16M _32M _64M 128M 256M 512M " 219 " __1G __2G __4G " " _>4G\n"); 220 221 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 222 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 223 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 224 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 225 str += sprintf(str, "Histogram of I/O times per sector\n"); 226 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 227 str += sprintf(str, "Histogram of I/O time till ssch\n"); 228 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 229 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 230 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 231 str += sprintf(str, "Histogram of I/O time between ssch " 232 "and irq per sector\n"); 233 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 234 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 235 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 236 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 237 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 238 len = str - page; 239 #else 240 len = sprintf(page, "Statistics are not activated in this kernel\n"); 241 #endif 242 return dasd_calc_metrics(page, start, off, count, eof, len); 243 } 244 245 static int 246 dasd_statistics_write(struct file *file, const char __user *user_buf, 247 unsigned long user_len, void *data) 248 { 249 #ifdef CONFIG_DASD_PROFILE 250 char *buffer, *str; 251 252 if (user_len > 65536) 253 user_len = 65536; 254 buffer = dasd_get_user_string(user_buf, user_len); 255 if (IS_ERR(buffer)) 256 return PTR_ERR(buffer); 257 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 258 259 /* check for valid verbs */ 260 for (str = buffer; isspace(*str); str++); 261 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 262 /* 'set xxx' was given */ 263 for (str = str + 4; isspace(*str); str++); 264 if (strcmp(str, "on") == 0) { 265 /* switch on statistics profiling */ 266 dasd_profile_level = DASD_PROFILE_ON; 267 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 268 } else if (strcmp(str, "off") == 0) { 269 /* switch off and reset statistics profiling */ 270 memset(&dasd_global_profile, 271 0, sizeof (struct dasd_profile_info_t)); 272 dasd_profile_level = DASD_PROFILE_OFF; 273 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 274 } else 275 goto out_error; 276 } else if (strncmp(str, "reset", 5) == 0) { 277 /* reset the statistics */ 278 memset(&dasd_global_profile, 0, 279 sizeof (struct dasd_profile_info_t)); 280 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 281 } else 282 goto out_error; 283 kfree(buffer); 284 return user_len; 285 out_error: 286 MESSAGE(KERN_WARNING, "%s", 287 "/proc/dasd/statistics: only 'set on', 'set off' " 288 "and 'reset' are supported verbs"); 289 kfree(buffer); 290 return -EINVAL; 291 #else 292 MESSAGE(KERN_WARNING, "%s", 293 "/proc/dasd/statistics: is not activated in this kernel"); 294 return user_len; 295 #endif /* CONFIG_DASD_PROFILE */ 296 } 297 298 int 299 dasd_proc_init(void) 300 { 301 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 302 dasd_proc_root_entry->owner = THIS_MODULE; 303 dasd_devices_entry = create_proc_entry("devices", 304 S_IFREG | S_IRUGO | S_IWUSR, 305 dasd_proc_root_entry); 306 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 307 dasd_devices_entry->owner = THIS_MODULE; 308 dasd_statistics_entry = create_proc_entry("statistics", 309 S_IFREG | S_IRUGO | S_IWUSR, 310 dasd_proc_root_entry); 311 dasd_statistics_entry->read_proc = dasd_statistics_read; 312 dasd_statistics_entry->write_proc = dasd_statistics_write; 313 dasd_statistics_entry->owner = THIS_MODULE; 314 return 0; 315 } 316 317 void 318 dasd_proc_exit(void) 319 { 320 remove_proc_entry("devices", dasd_proc_root_entry); 321 remove_proc_entry("statistics", dasd_proc_root_entry); 322 remove_proc_entry("dasd", &proc_root); 323 } 324