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: 1.30 $ 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 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 = test_bit(DASD_FLAG_RO, &device->flags) ? "(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_READY: 97 case DASD_STATE_ONLINE: 98 seq_printf(m, "active "); 99 if (dasd_check_blocksize(device->bp_block)) 100 seq_printf(m, "n/f "); 101 else 102 seq_printf(m, 103 "at blocksize: %d, %ld blocks, %ld MB", 104 device->bp_block, device->blocks, 105 ((device->bp_block >> 9) * 106 device->blocks) >> 11); 107 break; 108 default: 109 seq_printf(m, "no stat"); 110 break; 111 } 112 dasd_put_device(device); 113 if (dasd_probeonly) 114 seq_printf(m, "(probeonly)"); 115 seq_printf(m, "\n"); 116 return 0; 117 } 118 119 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 120 { 121 if (*pos >= dasd_max_devindex) 122 return NULL; 123 return (void *)((unsigned long) *pos + 1); 124 } 125 126 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 127 { 128 ++*pos; 129 return dasd_devices_start(m, pos); 130 } 131 132 static void dasd_devices_stop(struct seq_file *m, void *v) 133 { 134 } 135 136 static struct seq_operations dasd_devices_seq_ops = { 137 .start = dasd_devices_start, 138 .next = dasd_devices_next, 139 .stop = dasd_devices_stop, 140 .show = dasd_devices_show, 141 }; 142 143 static int dasd_devices_open(struct inode *inode, struct file *file) 144 { 145 return seq_open(file, &dasd_devices_seq_ops); 146 } 147 148 static struct file_operations dasd_devices_file_ops = { 149 .open = dasd_devices_open, 150 .read = seq_read, 151 .llseek = seq_lseek, 152 .release = seq_release, 153 }; 154 155 static inline int 156 dasd_calc_metrics(char *page, char **start, off_t off, 157 int count, int *eof, int len) 158 { 159 len = (len > off) ? len - off : 0; 160 if (len > count) 161 len = count; 162 if (len < count) 163 *eof = 1; 164 *start = page + off; 165 return len; 166 } 167 168 static inline char * 169 dasd_statistics_array(char *str, int *array, int shift) 170 { 171 int i; 172 173 for (i = 0; i < 32; i++) { 174 str += sprintf(str, "%7d ", array[i] >> shift); 175 if (i == 15) 176 str += sprintf(str, "\n"); 177 } 178 str += sprintf(str,"\n"); 179 return str; 180 } 181 182 static int 183 dasd_statistics_read(char *page, char **start, off_t off, 184 int count, int *eof, void *data) 185 { 186 unsigned long len; 187 #ifdef CONFIG_DASD_PROFILE 188 struct dasd_profile_info_t *prof; 189 char *str; 190 int shift; 191 192 /* check for active profiling */ 193 if (dasd_profile_level == DASD_PROFILE_OFF) { 194 len = sprintf(page, "Statistics are off - they might be " 195 "switched on using 'echo set on > " 196 "/proc/dasd/statistics'\n"); 197 return dasd_calc_metrics(page, start, off, count, eof, len); 198 } 199 200 prof = &dasd_global_profile; 201 /* prevent couter 'overflow' on output */ 202 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 203 204 str = page; 205 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 206 str += sprintf(str, "with %d sectors(512B each)\n", 207 prof->dasd_io_sects); 208 str += sprintf(str, 209 " __<4 ___8 __16 __32 __64 _128 " 210 " _256 _512 __1k __2k __4k __8k " 211 " _16k _32k _64k 128k\n"); 212 str += sprintf(str, 213 " _256 _512 __1M __2M __4M __8M " 214 " _16M _32M _64M 128M 256M 512M " 215 " __1G __2G __4G " " _>4G\n"); 216 217 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 218 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 219 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 220 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 221 str += sprintf(str, "Histogram of I/O times per sector\n"); 222 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 223 str += sprintf(str, "Histogram of I/O time till ssch\n"); 224 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 225 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 226 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 227 str += sprintf(str, "Histogram of I/O time between ssch " 228 "and irq per sector\n"); 229 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 230 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 231 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 232 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 233 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 234 len = str - page; 235 #else 236 len = sprintf(page, "Statistics are not activated in this kernel\n"); 237 #endif 238 return dasd_calc_metrics(page, start, off, count, eof, len); 239 } 240 241 static int 242 dasd_statistics_write(struct file *file, const char __user *user_buf, 243 unsigned long user_len, void *data) 244 { 245 #ifdef CONFIG_DASD_PROFILE 246 char *buffer, *str; 247 248 if (user_len > 65536) 249 user_len = 65536; 250 buffer = dasd_get_user_string(user_buf, user_len); 251 if (IS_ERR(buffer)) 252 return PTR_ERR(buffer); 253 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 254 255 /* check for valid verbs */ 256 for (str = buffer; isspace(*str); str++); 257 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 258 /* 'set xxx' was given */ 259 for (str = str + 4; isspace(*str); str++); 260 if (strcmp(str, "on") == 0) { 261 /* switch on statistics profiling */ 262 dasd_profile_level = DASD_PROFILE_ON; 263 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 264 } else if (strcmp(str, "off") == 0) { 265 /* switch off and reset statistics profiling */ 266 memset(&dasd_global_profile, 267 0, sizeof (struct dasd_profile_info_t)); 268 dasd_profile_level = DASD_PROFILE_OFF; 269 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 270 } else 271 goto out_error; 272 } else if (strncmp(str, "reset", 5) == 0) { 273 /* reset the statistics */ 274 memset(&dasd_global_profile, 0, 275 sizeof (struct dasd_profile_info_t)); 276 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 277 } else 278 goto out_error; 279 kfree(buffer); 280 return user_len; 281 out_error: 282 MESSAGE(KERN_WARNING, "%s", 283 "/proc/dasd/statistics: only 'set on', 'set off' " 284 "and 'reset' are supported verbs"); 285 kfree(buffer); 286 return -EINVAL; 287 #else 288 MESSAGE(KERN_WARNING, "%s", 289 "/proc/dasd/statistics: is not activated in this kernel"); 290 return user_len; 291 #endif /* CONFIG_DASD_PROFILE */ 292 } 293 294 int 295 dasd_proc_init(void) 296 { 297 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 298 dasd_proc_root_entry->owner = THIS_MODULE; 299 dasd_devices_entry = create_proc_entry("devices", 300 S_IFREG | S_IRUGO | S_IWUSR, 301 dasd_proc_root_entry); 302 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 303 dasd_devices_entry->owner = THIS_MODULE; 304 dasd_statistics_entry = create_proc_entry("statistics", 305 S_IFREG | S_IRUGO | S_IWUSR, 306 dasd_proc_root_entry); 307 dasd_statistics_entry->read_proc = dasd_statistics_read; 308 dasd_statistics_entry->write_proc = dasd_statistics_write; 309 dasd_statistics_entry->owner = THIS_MODULE; 310 return 0; 311 } 312 313 void 314 dasd_proc_exit(void) 315 { 316 remove_proc_entry("devices", dasd_proc_root_entry); 317 remove_proc_entry("statistics", dasd_proc_root_entry); 318 remove_proc_entry("dasd", &proc_root); 319 } 320