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: 1.33 $ 13 */ 14 15 #include <linux/config.h> 16 #include <linux/ctype.h> 17 #include <linux/seq_file.h> 18 #include <linux/vmalloc.h> 19 #include <linux/proc_fs.h> 20 21 #include <asm/debug.h> 22 #include <asm/uaccess.h> 23 24 /* This is ugly... */ 25 #define PRINTK_HEADER "dasd_proc:" 26 27 #include "dasd_int.h" 28 29 static struct proc_dir_entry *dasd_proc_root_entry = NULL; 30 static struct proc_dir_entry *dasd_devices_entry = NULL; 31 static struct proc_dir_entry *dasd_statistics_entry = NULL; 32 33 static inline char * 34 dasd_get_user_string(const char __user *user_buf, size_t user_len) 35 { 36 char *buffer; 37 38 buffer = kmalloc(user_len + 1, GFP_KERNEL); 39 if (buffer == NULL) 40 return ERR_PTR(-ENOMEM); 41 if (copy_from_user(buffer, user_buf, user_len) != 0) { 42 kfree(buffer); 43 return ERR_PTR(-EFAULT); 44 } 45 /* got the string, now strip linefeed. */ 46 if (buffer[user_len - 1] == '\n') 47 buffer[user_len - 1] = 0; 48 else 49 buffer[user_len] = 0; 50 return buffer; 51 } 52 53 static int 54 dasd_devices_show(struct seq_file *m, void *v) 55 { 56 struct dasd_device *device; 57 char *substr; 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 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 82 seq_printf(m, "%4s: ", substr); 83 /* Print device status information. */ 84 switch ((device != NULL) ? device->state : -1) { 85 case -1: 86 seq_printf(m, "unknown"); 87 break; 88 case DASD_STATE_NEW: 89 seq_printf(m, "new"); 90 break; 91 case DASD_STATE_KNOWN: 92 seq_printf(m, "detected"); 93 break; 94 case DASD_STATE_BASIC: 95 seq_printf(m, "basic"); 96 break; 97 case DASD_STATE_READY: 98 case DASD_STATE_ONLINE: 99 seq_printf(m, "active "); 100 if (dasd_check_blocksize(device->bp_block)) 101 seq_printf(m, "n/f "); 102 else 103 seq_printf(m, 104 "at blocksize: %d, %ld blocks, %ld MB", 105 device->bp_block, device->blocks, 106 ((device->bp_block >> 9) * 107 device->blocks) >> 11); 108 break; 109 default: 110 seq_printf(m, "no stat"); 111 break; 112 } 113 dasd_put_device(device); 114 if (dasd_probeonly) 115 seq_printf(m, "(probeonly)"); 116 seq_printf(m, "\n"); 117 return 0; 118 } 119 120 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 121 { 122 if (*pos >= dasd_max_devindex) 123 return NULL; 124 return (void *)((unsigned long) *pos + 1); 125 } 126 127 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 128 { 129 ++*pos; 130 return dasd_devices_start(m, pos); 131 } 132 133 static void dasd_devices_stop(struct seq_file *m, void *v) 134 { 135 } 136 137 static struct seq_operations dasd_devices_seq_ops = { 138 .start = dasd_devices_start, 139 .next = dasd_devices_next, 140 .stop = dasd_devices_stop, 141 .show = dasd_devices_show, 142 }; 143 144 static int dasd_devices_open(struct inode *inode, struct file *file) 145 { 146 return seq_open(file, &dasd_devices_seq_ops); 147 } 148 149 static struct file_operations dasd_devices_file_ops = { 150 .open = dasd_devices_open, 151 .read = seq_read, 152 .llseek = seq_lseek, 153 .release = seq_release, 154 }; 155 156 static inline int 157 dasd_calc_metrics(char *page, char **start, off_t off, 158 int count, int *eof, int len) 159 { 160 len = (len > off) ? len - off : 0; 161 if (len > count) 162 len = count; 163 if (len < count) 164 *eof = 1; 165 *start = page + off; 166 return len; 167 } 168 169 static inline char * 170 dasd_statistics_array(char *str, int *array, int shift) 171 { 172 int i; 173 174 for (i = 0; i < 32; i++) { 175 str += sprintf(str, "%7d ", array[i] >> shift); 176 if (i == 15) 177 str += sprintf(str, "\n"); 178 } 179 str += sprintf(str,"\n"); 180 return str; 181 } 182 183 static int 184 dasd_statistics_read(char *page, char **start, off_t off, 185 int count, int *eof, void *data) 186 { 187 unsigned long len; 188 #ifdef CONFIG_DASD_PROFILE 189 struct dasd_profile_info_t *prof; 190 char *str; 191 int shift; 192 193 /* check for active profiling */ 194 if (dasd_profile_level == DASD_PROFILE_OFF) { 195 len = sprintf(page, "Statistics are off - they might be " 196 "switched on using 'echo set on > " 197 "/proc/dasd/statistics'\n"); 198 return dasd_calc_metrics(page, start, off, count, eof, len); 199 } 200 201 prof = &dasd_global_profile; 202 /* prevent couter 'overflow' on output */ 203 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 204 205 str = page; 206 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 207 str += sprintf(str, "with %d sectors(512B each)\n", 208 prof->dasd_io_sects); 209 str += sprintf(str, 210 " __<4 ___8 __16 __32 __64 _128 " 211 " _256 _512 __1k __2k __4k __8k " 212 " _16k _32k _64k 128k\n"); 213 str += sprintf(str, 214 " _256 _512 __1M __2M __4M __8M " 215 " _16M _32M _64M 128M 256M 512M " 216 " __1G __2G __4G " " _>4G\n"); 217 218 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 219 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 220 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 221 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 222 str += sprintf(str, "Histogram of I/O times per sector\n"); 223 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 224 str += sprintf(str, "Histogram of I/O time till ssch\n"); 225 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 226 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 227 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 228 str += sprintf(str, "Histogram of I/O time between ssch " 229 "and irq per sector\n"); 230 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 231 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 232 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 233 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 234 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 235 len = str - page; 236 #else 237 len = sprintf(page, "Statistics are not activated in this kernel\n"); 238 #endif 239 return dasd_calc_metrics(page, start, off, count, eof, len); 240 } 241 242 static int 243 dasd_statistics_write(struct file *file, const char __user *user_buf, 244 unsigned long user_len, void *data) 245 { 246 #ifdef CONFIG_DASD_PROFILE 247 char *buffer, *str; 248 249 if (user_len > 65536) 250 user_len = 65536; 251 buffer = dasd_get_user_string(user_buf, user_len); 252 if (IS_ERR(buffer)) 253 return PTR_ERR(buffer); 254 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 255 256 /* check for valid verbs */ 257 for (str = buffer; isspace(*str); str++); 258 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 259 /* 'set xxx' was given */ 260 for (str = str + 4; isspace(*str); str++); 261 if (strcmp(str, "on") == 0) { 262 /* switch on statistics profiling */ 263 dasd_profile_level = DASD_PROFILE_ON; 264 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 265 } else if (strcmp(str, "off") == 0) { 266 /* switch off and reset statistics profiling */ 267 memset(&dasd_global_profile, 268 0, sizeof (struct dasd_profile_info_t)); 269 dasd_profile_level = DASD_PROFILE_OFF; 270 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 271 } else 272 goto out_error; 273 } else if (strncmp(str, "reset", 5) == 0) { 274 /* reset the statistics */ 275 memset(&dasd_global_profile, 0, 276 sizeof (struct dasd_profile_info_t)); 277 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 278 } else 279 goto out_error; 280 kfree(buffer); 281 return user_len; 282 out_error: 283 MESSAGE(KERN_WARNING, "%s", 284 "/proc/dasd/statistics: only 'set on', 'set off' " 285 "and 'reset' are supported verbs"); 286 kfree(buffer); 287 return -EINVAL; 288 #else 289 MESSAGE(KERN_WARNING, "%s", 290 "/proc/dasd/statistics: is not activated in this kernel"); 291 return user_len; 292 #endif /* CONFIG_DASD_PROFILE */ 293 } 294 295 int 296 dasd_proc_init(void) 297 { 298 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 299 dasd_proc_root_entry->owner = THIS_MODULE; 300 dasd_devices_entry = create_proc_entry("devices", 301 S_IFREG | S_IRUGO | S_IWUSR, 302 dasd_proc_root_entry); 303 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 304 dasd_devices_entry->owner = THIS_MODULE; 305 dasd_statistics_entry = create_proc_entry("statistics", 306 S_IFREG | S_IRUGO | S_IWUSR, 307 dasd_proc_root_entry); 308 dasd_statistics_entry->read_proc = dasd_statistics_read; 309 dasd_statistics_entry->write_proc = dasd_statistics_write; 310 dasd_statistics_entry->owner = THIS_MODULE; 311 return 0; 312 } 313 314 void 315 dasd_proc_exit(void) 316 { 317 remove_proc_entry("devices", dasd_proc_root_entry); 318 remove_proc_entry("statistics", dasd_proc_root_entry); 319 remove_proc_entry("dasd", &proc_root); 320 } 321