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: 1.32 $ 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 int feature; 59 60 device = dasd_device_from_devindex((unsigned long) v - 1); 61 if (IS_ERR(device)) 62 return 0; 63 /* Print device number. */ 64 seq_printf(m, "%s", device->cdev->dev.bus_id); 65 /* Print discipline string. */ 66 if (device != NULL && device->discipline != NULL) 67 seq_printf(m, "(%s)", device->discipline->name); 68 else 69 seq_printf(m, "(none)"); 70 /* Print kdev. */ 71 if (device->gdp) 72 seq_printf(m, " at (%3d:%6d)", 73 device->gdp->major, device->gdp->first_minor); 74 else 75 seq_printf(m, " at (???:??????)"); 76 /* Print device name. */ 77 if (device->gdp) 78 seq_printf(m, " is %-8s", device->gdp->disk_name); 79 else 80 seq_printf(m, " is ????????"); 81 /* Print devices features. */ 82 feature = dasd_get_feature(device->cdev, DASD_FEATURE_READONLY); 83 if (feature < 0) 84 return 0; 85 substr = feature ? "(ro)" : " "; 86 seq_printf(m, "%4s: ", substr); 87 /* Print device status information. */ 88 switch ((device != NULL) ? device->state : -1) { 89 case -1: 90 seq_printf(m, "unknown"); 91 break; 92 case DASD_STATE_NEW: 93 seq_printf(m, "new"); 94 break; 95 case DASD_STATE_KNOWN: 96 seq_printf(m, "detected"); 97 break; 98 case DASD_STATE_BASIC: 99 seq_printf(m, "basic"); 100 break; 101 case DASD_STATE_READY: 102 case DASD_STATE_ONLINE: 103 seq_printf(m, "active "); 104 if (dasd_check_blocksize(device->bp_block)) 105 seq_printf(m, "n/f "); 106 else 107 seq_printf(m, 108 "at blocksize: %d, %ld blocks, %ld MB", 109 device->bp_block, device->blocks, 110 ((device->bp_block >> 9) * 111 device->blocks) >> 11); 112 break; 113 default: 114 seq_printf(m, "no stat"); 115 break; 116 } 117 dasd_put_device(device); 118 if (dasd_probeonly) 119 seq_printf(m, "(probeonly)"); 120 seq_printf(m, "\n"); 121 return 0; 122 } 123 124 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 125 { 126 if (*pos >= dasd_max_devindex) 127 return NULL; 128 return (void *)((unsigned long) *pos + 1); 129 } 130 131 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 132 { 133 ++*pos; 134 return dasd_devices_start(m, pos); 135 } 136 137 static void dasd_devices_stop(struct seq_file *m, void *v) 138 { 139 } 140 141 static struct seq_operations dasd_devices_seq_ops = { 142 .start = dasd_devices_start, 143 .next = dasd_devices_next, 144 .stop = dasd_devices_stop, 145 .show = dasd_devices_show, 146 }; 147 148 static int dasd_devices_open(struct inode *inode, struct file *file) 149 { 150 return seq_open(file, &dasd_devices_seq_ops); 151 } 152 153 static struct file_operations dasd_devices_file_ops = { 154 .open = dasd_devices_open, 155 .read = seq_read, 156 .llseek = seq_lseek, 157 .release = seq_release, 158 }; 159 160 static inline int 161 dasd_calc_metrics(char *page, char **start, off_t off, 162 int count, int *eof, int len) 163 { 164 len = (len > off) ? len - off : 0; 165 if (len > count) 166 len = count; 167 if (len < count) 168 *eof = 1; 169 *start = page + off; 170 return len; 171 } 172 173 static inline char * 174 dasd_statistics_array(char *str, int *array, int shift) 175 { 176 int i; 177 178 for (i = 0; i < 32; i++) { 179 str += sprintf(str, "%7d ", array[i] >> shift); 180 if (i == 15) 181 str += sprintf(str, "\n"); 182 } 183 str += sprintf(str,"\n"); 184 return str; 185 } 186 187 static int 188 dasd_statistics_read(char *page, char **start, off_t off, 189 int count, int *eof, void *data) 190 { 191 unsigned long len; 192 #ifdef CONFIG_DASD_PROFILE 193 struct dasd_profile_info_t *prof; 194 char *str; 195 int shift; 196 197 /* check for active profiling */ 198 if (dasd_profile_level == DASD_PROFILE_OFF) { 199 len = sprintf(page, "Statistics are off - they might be " 200 "switched on using 'echo set on > " 201 "/proc/dasd/statistics'\n"); 202 return dasd_calc_metrics(page, start, off, count, eof, len); 203 } 204 205 prof = &dasd_global_profile; 206 /* prevent couter 'overflow' on output */ 207 for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++); 208 209 str = page; 210 str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); 211 str += sprintf(str, "with %d sectors(512B each)\n", 212 prof->dasd_io_sects); 213 str += sprintf(str, 214 " __<4 ___8 __16 __32 __64 _128 " 215 " _256 _512 __1k __2k __4k __8k " 216 " _16k _32k _64k 128k\n"); 217 str += sprintf(str, 218 " _256 _512 __1M __2M __4M __8M " 219 " _16M _32M _64M 128M 256M 512M " 220 " __1G __2G __4G " " _>4G\n"); 221 222 str += sprintf(str, "Histogram of sizes (512B secs)\n"); 223 str = dasd_statistics_array(str, prof->dasd_io_secs, shift); 224 str += sprintf(str, "Histogram of I/O times (microseconds)\n"); 225 str = dasd_statistics_array(str, prof->dasd_io_times, shift); 226 str += sprintf(str, "Histogram of I/O times per sector\n"); 227 str = dasd_statistics_array(str, prof->dasd_io_timps, shift); 228 str += sprintf(str, "Histogram of I/O time till ssch\n"); 229 str = dasd_statistics_array(str, prof->dasd_io_time1, shift); 230 str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); 231 str = dasd_statistics_array(str, prof->dasd_io_time2, shift); 232 str += sprintf(str, "Histogram of I/O time between ssch " 233 "and irq per sector\n"); 234 str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift); 235 str += sprintf(str, "Histogram of I/O time between irq and end\n"); 236 str = dasd_statistics_array(str, prof->dasd_io_time3, shift); 237 str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); 238 str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift); 239 len = str - page; 240 #else 241 len = sprintf(page, "Statistics are not activated in this kernel\n"); 242 #endif 243 return dasd_calc_metrics(page, start, off, count, eof, len); 244 } 245 246 static int 247 dasd_statistics_write(struct file *file, const char __user *user_buf, 248 unsigned long user_len, void *data) 249 { 250 #ifdef CONFIG_DASD_PROFILE 251 char *buffer, *str; 252 253 if (user_len > 65536) 254 user_len = 65536; 255 buffer = dasd_get_user_string(user_buf, user_len); 256 if (IS_ERR(buffer)) 257 return PTR_ERR(buffer); 258 MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer); 259 260 /* check for valid verbs */ 261 for (str = buffer; isspace(*str); str++); 262 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 263 /* 'set xxx' was given */ 264 for (str = str + 4; isspace(*str); str++); 265 if (strcmp(str, "on") == 0) { 266 /* switch on statistics profiling */ 267 dasd_profile_level = DASD_PROFILE_ON; 268 MESSAGE(KERN_INFO, "%s", "Statistics switched on"); 269 } else if (strcmp(str, "off") == 0) { 270 /* switch off and reset statistics profiling */ 271 memset(&dasd_global_profile, 272 0, sizeof (struct dasd_profile_info_t)); 273 dasd_profile_level = DASD_PROFILE_OFF; 274 MESSAGE(KERN_INFO, "%s", "Statistics switched off"); 275 } else 276 goto out_error; 277 } else if (strncmp(str, "reset", 5) == 0) { 278 /* reset the statistics */ 279 memset(&dasd_global_profile, 0, 280 sizeof (struct dasd_profile_info_t)); 281 MESSAGE(KERN_INFO, "%s", "Statistics reset"); 282 } else 283 goto out_error; 284 kfree(buffer); 285 return user_len; 286 out_error: 287 MESSAGE(KERN_WARNING, "%s", 288 "/proc/dasd/statistics: only 'set on', 'set off' " 289 "and 'reset' are supported verbs"); 290 kfree(buffer); 291 return -EINVAL; 292 #else 293 MESSAGE(KERN_WARNING, "%s", 294 "/proc/dasd/statistics: is not activated in this kernel"); 295 return user_len; 296 #endif /* CONFIG_DASD_PROFILE */ 297 } 298 299 int 300 dasd_proc_init(void) 301 { 302 dasd_proc_root_entry = proc_mkdir("dasd", &proc_root); 303 dasd_proc_root_entry->owner = THIS_MODULE; 304 dasd_devices_entry = create_proc_entry("devices", 305 S_IFREG | S_IRUGO | S_IWUSR, 306 dasd_proc_root_entry); 307 dasd_devices_entry->proc_fops = &dasd_devices_file_ops; 308 dasd_devices_entry->owner = THIS_MODULE; 309 dasd_statistics_entry = create_proc_entry("statistics", 310 S_IFREG | S_IRUGO | S_IWUSR, 311 dasd_proc_root_entry); 312 dasd_statistics_entry->read_proc = dasd_statistics_read; 313 dasd_statistics_entry->write_proc = dasd_statistics_write; 314 dasd_statistics_entry->owner = THIS_MODULE; 315 return 0; 316 } 317 318 void 319 dasd_proc_exit(void) 320 { 321 remove_proc_entry("devices", dasd_proc_root_entry); 322 remove_proc_entry("statistics", dasd_proc_root_entry); 323 remove_proc_entry("dasd", &proc_root); 324 } 325