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 #ifdef CONFIG_DASD_PROFILE 169 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) 170 { 171 int i; 172 173 for (i = 0; i < 32; i++) { 174 seq_printf(m, "%7d ", array[i] / factor); 175 if (i == 15) 176 seq_putc(m, '\n'); 177 } 178 seq_putc(m, '\n'); 179 } 180 #endif /* CONFIG_DASD_PROFILE */ 181 182 static int dasd_stats_proc_show(struct seq_file *m, void *v) 183 { 184 #ifdef CONFIG_DASD_PROFILE 185 struct dasd_profile_info_t *prof; 186 int factor; 187 188 /* check for active profiling */ 189 if (dasd_profile_level == DASD_PROFILE_OFF) { 190 seq_printf(m, "Statistics are off - they might be " 191 "switched on using 'echo set on > " 192 "/proc/dasd/statistics'\n"); 193 return 0; 194 } 195 196 prof = &dasd_global_profile; 197 /* prevent counter 'overflow' on output */ 198 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; 199 factor *= 10); 200 201 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); 202 seq_printf(m, "with %u sectors(512B each)\n", 203 prof->dasd_io_sects); 204 seq_printf(m, "Scale Factor is %d\n", factor); 205 seq_printf(m, 206 " __<4 ___8 __16 __32 __64 _128 " 207 " _256 _512 __1k __2k __4k __8k " 208 " _16k _32k _64k 128k\n"); 209 seq_printf(m, 210 " _256 _512 __1M __2M __4M __8M " 211 " _16M _32M _64M 128M 256M 512M " 212 " __1G __2G __4G " " _>4G\n"); 213 214 seq_printf(m, "Histogram of sizes (512B secs)\n"); 215 dasd_statistics_array(m, prof->dasd_io_secs, factor); 216 seq_printf(m, "Histogram of I/O times (microseconds)\n"); 217 dasd_statistics_array(m, prof->dasd_io_times, factor); 218 seq_printf(m, "Histogram of I/O times per sector\n"); 219 dasd_statistics_array(m, prof->dasd_io_timps, factor); 220 seq_printf(m, "Histogram of I/O time till ssch\n"); 221 dasd_statistics_array(m, prof->dasd_io_time1, factor); 222 seq_printf(m, "Histogram of I/O time between ssch and irq\n"); 223 dasd_statistics_array(m, prof->dasd_io_time2, factor); 224 seq_printf(m, "Histogram of I/O time between ssch " 225 "and irq per sector\n"); 226 dasd_statistics_array(m, prof->dasd_io_time2ps, factor); 227 seq_printf(m, "Histogram of I/O time between irq and end\n"); 228 dasd_statistics_array(m, prof->dasd_io_time3, factor); 229 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); 230 dasd_statistics_array(m, prof->dasd_io_nr_req, factor); 231 #else 232 seq_printf(m, "Statistics are not activated in this kernel\n"); 233 #endif 234 return 0; 235 } 236 237 static int dasd_stats_proc_open(struct inode *inode, struct file *file) 238 { 239 return single_open(file, dasd_stats_proc_show, NULL); 240 } 241 242 static ssize_t dasd_stats_proc_write(struct file *file, 243 const char __user *user_buf, size_t user_len, loff_t *pos) 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 DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer); 254 255 /* check for valid verbs */ 256 str = skip_spaces(buffer); 257 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 258 /* 'set xxx' was given */ 259 str = skip_spaces(str + 4); 260 if (strcmp(str, "on") == 0) { 261 /* switch on statistics profiling */ 262 dasd_profile_level = DASD_PROFILE_ON; 263 pr_info("The statistics feature has been switched " 264 "on\n"); 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 pr_info("The statistics feature has been switched " 271 "off\n"); 272 } else 273 goto out_error; 274 } else if (strncmp(str, "reset", 5) == 0) { 275 /* reset the statistics */ 276 memset(&dasd_global_profile, 0, 277 sizeof (struct dasd_profile_info_t)); 278 pr_info("The statistics have been reset\n"); 279 } else 280 goto out_error; 281 kfree(buffer); 282 return user_len; 283 out_error: 284 pr_warning("%s is not a supported value for /proc/dasd/statistics\n", 285 str); 286 kfree(buffer); 287 return -EINVAL; 288 #else 289 pr_warning("/proc/dasd/statistics: is not activated in this kernel\n"); 290 return user_len; 291 #endif /* CONFIG_DASD_PROFILE */ 292 } 293 294 static const struct file_operations dasd_stats_proc_fops = { 295 .owner = THIS_MODULE, 296 .open = dasd_stats_proc_open, 297 .read = seq_read, 298 .llseek = seq_lseek, 299 .release = single_release, 300 .write = dasd_stats_proc_write, 301 }; 302 303 /* 304 * Create dasd proc-fs entries. 305 * In case creation failed, cleanup and return -ENOENT. 306 */ 307 int 308 dasd_proc_init(void) 309 { 310 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 311 if (!dasd_proc_root_entry) 312 goto out_nodasd; 313 dasd_devices_entry = proc_create("devices", 314 S_IFREG | S_IRUGO | S_IWUSR, 315 dasd_proc_root_entry, 316 &dasd_devices_file_ops); 317 if (!dasd_devices_entry) 318 goto out_nodevices; 319 dasd_statistics_entry = proc_create("statistics", 320 S_IFREG | S_IRUGO | S_IWUSR, 321 dasd_proc_root_entry, 322 &dasd_stats_proc_fops); 323 if (!dasd_statistics_entry) 324 goto out_nostatistics; 325 return 0; 326 327 out_nostatistics: 328 remove_proc_entry("devices", dasd_proc_root_entry); 329 out_nodevices: 330 remove_proc_entry("dasd", NULL); 331 out_nodasd: 332 return -ENOENT; 333 } 334 335 void 336 dasd_proc_exit(void) 337 { 338 remove_proc_entry("devices", dasd_proc_root_entry); 339 remove_proc_entry("statistics", dasd_proc_root_entry); 340 remove_proc_entry("dasd", NULL); 341 } 342