1 // SPDX-License-Identifier: GPL-2.0 2 /* 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 * Copyright IBM Corp. 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/slab.h> 18 #include <linux/string.h> 19 #include <linux/seq_file.h> 20 #include <linux/vmalloc.h> 21 #include <linux/proc_fs.h> 22 23 #include <asm/debug.h> 24 #include <linux/uaccess.h> 25 26 /* This is ugly... */ 27 #define PRINTK_HEADER "dasd_proc:" 28 29 #include "dasd_int.h" 30 31 static struct proc_dir_entry *dasd_proc_root_entry = NULL; 32 static struct proc_dir_entry *dasd_devices_entry = NULL; 33 static struct proc_dir_entry *dasd_statistics_entry = NULL; 34 35 static int 36 dasd_devices_show(struct seq_file *m, void *v) 37 { 38 struct dasd_device *device; 39 struct dasd_block *block; 40 char *substr; 41 42 device = dasd_device_from_devindex((unsigned long) v - 1); 43 if (IS_ERR(device)) 44 return 0; 45 if (device->block) 46 block = device->block; 47 else { 48 dasd_put_device(device); 49 return 0; 50 } 51 /* Print device number. */ 52 seq_printf(m, "%s", dev_name(&device->cdev->dev)); 53 /* Print discipline string. */ 54 if (device->discipline != NULL) 55 seq_printf(m, "(%s)", device->discipline->name); 56 else 57 seq_printf(m, "(none)"); 58 /* Print kdev. */ 59 if (block->gdp) 60 seq_printf(m, " at (%3d:%6d)", 61 MAJOR(disk_devt(block->gdp)), 62 MINOR(disk_devt(block->gdp))); 63 else 64 seq_printf(m, " at (???:??????)"); 65 /* Print device name. */ 66 if (block->gdp) 67 seq_printf(m, " is %-8s", block->gdp->disk_name); 68 else 69 seq_printf(m, " is ????????"); 70 /* Print devices features. */ 71 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; 72 seq_printf(m, "%4s: ", substr); 73 /* Print device status information. */ 74 switch (device->state) { 75 case DASD_STATE_NEW: 76 seq_printf(m, "new"); 77 break; 78 case DASD_STATE_KNOWN: 79 seq_printf(m, "detected"); 80 break; 81 case DASD_STATE_BASIC: 82 seq_printf(m, "basic"); 83 break; 84 case DASD_STATE_UNFMT: 85 seq_printf(m, "unformatted"); 86 break; 87 case DASD_STATE_READY: 88 case DASD_STATE_ONLINE: 89 seq_printf(m, "active "); 90 if (dasd_check_blocksize(block->bp_block)) 91 seq_printf(m, "n/f "); 92 else 93 seq_printf(m, 94 "at blocksize: %u, %lu blocks, %lu MB", 95 block->bp_block, block->blocks, 96 ((block->bp_block >> 9) * 97 block->blocks) >> 11); 98 break; 99 default: 100 seq_printf(m, "no stat"); 101 break; 102 } 103 dasd_put_device(device); 104 if (dasd_probeonly) 105 seq_printf(m, "(probeonly)"); 106 seq_printf(m, "\n"); 107 return 0; 108 } 109 110 static void *dasd_devices_start(struct seq_file *m, loff_t *pos) 111 { 112 if (*pos >= dasd_max_devindex) 113 return NULL; 114 return (void *)((unsigned long) *pos + 1); 115 } 116 117 static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) 118 { 119 ++*pos; 120 return dasd_devices_start(m, pos); 121 } 122 123 static void dasd_devices_stop(struct seq_file *m, void *v) 124 { 125 } 126 127 static const struct seq_operations dasd_devices_seq_ops = { 128 .start = dasd_devices_start, 129 .next = dasd_devices_next, 130 .stop = dasd_devices_stop, 131 .show = dasd_devices_show, 132 }; 133 134 #ifdef CONFIG_DASD_PROFILE 135 static int dasd_stats_all_block_on(void) 136 { 137 int i, rc; 138 struct dasd_device *device; 139 140 rc = 0; 141 for (i = 0; i < dasd_max_devindex; ++i) { 142 device = dasd_device_from_devindex(i); 143 if (IS_ERR(device)) 144 continue; 145 if (device->block) 146 rc = dasd_profile_on(&device->block->profile); 147 dasd_put_device(device); 148 if (rc) 149 return rc; 150 } 151 return 0; 152 } 153 154 static void dasd_stats_all_block_off(void) 155 { 156 int i; 157 struct dasd_device *device; 158 159 for (i = 0; i < dasd_max_devindex; ++i) { 160 device = dasd_device_from_devindex(i); 161 if (IS_ERR(device)) 162 continue; 163 if (device->block) 164 dasd_profile_off(&device->block->profile); 165 dasd_put_device(device); 166 } 167 } 168 169 static void dasd_stats_all_block_reset(void) 170 { 171 int i; 172 struct dasd_device *device; 173 174 for (i = 0; i < dasd_max_devindex; ++i) { 175 device = dasd_device_from_devindex(i); 176 if (IS_ERR(device)) 177 continue; 178 if (device->block) 179 dasd_profile_reset(&device->block->profile); 180 dasd_put_device(device); 181 } 182 } 183 184 static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor) 185 { 186 int i; 187 188 for (i = 0; i < 32; i++) { 189 seq_printf(m, "%7d ", array[i] / factor); 190 if (i == 15) 191 seq_putc(m, '\n'); 192 } 193 seq_putc(m, '\n'); 194 } 195 #endif /* CONFIG_DASD_PROFILE */ 196 197 static int dasd_stats_proc_show(struct seq_file *m, void *v) 198 { 199 #ifdef CONFIG_DASD_PROFILE 200 struct dasd_profile_info *prof; 201 int factor; 202 203 spin_lock_bh(&dasd_global_profile.lock); 204 prof = dasd_global_profile.data; 205 if (!prof) { 206 spin_unlock_bh(&dasd_global_profile.lock); 207 seq_printf(m, "Statistics are off - they might be " 208 "switched on using 'echo set on > " 209 "/proc/dasd/statistics'\n"); 210 return 0; 211 } 212 213 /* prevent counter 'overflow' on output */ 214 for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; 215 factor *= 10); 216 217 seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs); 218 seq_printf(m, "with %u sectors(512B each)\n", 219 prof->dasd_io_sects); 220 seq_printf(m, "Scale Factor is %d\n", factor); 221 seq_printf(m, 222 " __<4 ___8 __16 __32 __64 _128 " 223 " _256 _512 __1k __2k __4k __8k " 224 " _16k _32k _64k 128k\n"); 225 seq_printf(m, 226 " _256 _512 __1M __2M __4M __8M " 227 " _16M _32M _64M 128M 256M 512M " 228 " __1G __2G __4G " " _>4G\n"); 229 230 seq_printf(m, "Histogram of sizes (512B secs)\n"); 231 dasd_statistics_array(m, prof->dasd_io_secs, factor); 232 seq_printf(m, "Histogram of I/O times (microseconds)\n"); 233 dasd_statistics_array(m, prof->dasd_io_times, factor); 234 seq_printf(m, "Histogram of I/O times per sector\n"); 235 dasd_statistics_array(m, prof->dasd_io_timps, factor); 236 seq_printf(m, "Histogram of I/O time till ssch\n"); 237 dasd_statistics_array(m, prof->dasd_io_time1, factor); 238 seq_printf(m, "Histogram of I/O time between ssch and irq\n"); 239 dasd_statistics_array(m, prof->dasd_io_time2, factor); 240 seq_printf(m, "Histogram of I/O time between ssch " 241 "and irq per sector\n"); 242 dasd_statistics_array(m, prof->dasd_io_time2ps, factor); 243 seq_printf(m, "Histogram of I/O time between irq and end\n"); 244 dasd_statistics_array(m, prof->dasd_io_time3, factor); 245 seq_printf(m, "# of req in chanq at enqueuing (1..32) \n"); 246 dasd_statistics_array(m, prof->dasd_io_nr_req, factor); 247 spin_unlock_bh(&dasd_global_profile.lock); 248 #else 249 seq_printf(m, "Statistics are not activated in this kernel\n"); 250 #endif 251 return 0; 252 } 253 254 static int dasd_stats_proc_open(struct inode *inode, struct file *file) 255 { 256 return single_open(file, dasd_stats_proc_show, NULL); 257 } 258 259 static ssize_t dasd_stats_proc_write(struct file *file, 260 const char __user *user_buf, size_t user_len, loff_t *pos) 261 { 262 #ifdef CONFIG_DASD_PROFILE 263 char *buffer, *str; 264 int rc; 265 266 if (user_len > 65536) 267 user_len = 65536; 268 buffer = dasd_get_user_string(user_buf, user_len); 269 if (IS_ERR(buffer)) 270 return PTR_ERR(buffer); 271 272 /* check for valid verbs */ 273 str = skip_spaces(buffer); 274 if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { 275 /* 'set xxx' was given */ 276 str = skip_spaces(str + 4); 277 if (strcmp(str, "on") == 0) { 278 /* switch on statistics profiling */ 279 rc = dasd_stats_all_block_on(); 280 if (rc) { 281 dasd_stats_all_block_off(); 282 goto out_error; 283 } 284 rc = dasd_profile_on(&dasd_global_profile); 285 if (rc) { 286 dasd_stats_all_block_off(); 287 goto out_error; 288 } 289 dasd_profile_reset(&dasd_global_profile); 290 dasd_global_profile_level = DASD_PROFILE_ON; 291 pr_info("The statistics feature has been switched " 292 "on\n"); 293 } else if (strcmp(str, "off") == 0) { 294 /* switch off statistics profiling */ 295 dasd_global_profile_level = DASD_PROFILE_OFF; 296 dasd_profile_off(&dasd_global_profile); 297 dasd_stats_all_block_off(); 298 pr_info("The statistics feature has been switched " 299 "off\n"); 300 } else 301 goto out_parse_error; 302 } else if (strncmp(str, "reset", 5) == 0) { 303 /* reset the statistics */ 304 dasd_profile_reset(&dasd_global_profile); 305 dasd_stats_all_block_reset(); 306 pr_info("The statistics have been reset\n"); 307 } else 308 goto out_parse_error; 309 vfree(buffer); 310 return user_len; 311 out_parse_error: 312 rc = -EINVAL; 313 pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str); 314 out_error: 315 vfree(buffer); 316 return rc; 317 #else 318 pr_warn("/proc/dasd/statistics: is not activated in this kernel\n"); 319 return user_len; 320 #endif /* CONFIG_DASD_PROFILE */ 321 } 322 323 static const struct file_operations dasd_stats_proc_fops = { 324 .owner = THIS_MODULE, 325 .open = dasd_stats_proc_open, 326 .read = seq_read, 327 .llseek = seq_lseek, 328 .release = single_release, 329 .write = dasd_stats_proc_write, 330 }; 331 332 /* 333 * Create dasd proc-fs entries. 334 * In case creation failed, cleanup and return -ENOENT. 335 */ 336 int 337 dasd_proc_init(void) 338 { 339 dasd_proc_root_entry = proc_mkdir("dasd", NULL); 340 if (!dasd_proc_root_entry) 341 goto out_nodasd; 342 dasd_devices_entry = proc_create_seq("devices", 0444, 343 dasd_proc_root_entry, 344 &dasd_devices_seq_ops); 345 if (!dasd_devices_entry) 346 goto out_nodevices; 347 dasd_statistics_entry = proc_create("statistics", 348 S_IFREG | S_IRUGO | S_IWUSR, 349 dasd_proc_root_entry, 350 &dasd_stats_proc_fops); 351 if (!dasd_statistics_entry) 352 goto out_nostatistics; 353 return 0; 354 355 out_nostatistics: 356 remove_proc_entry("devices", dasd_proc_root_entry); 357 out_nodevices: 358 remove_proc_entry("dasd", NULL); 359 out_nodasd: 360 return -ENOENT; 361 } 362 363 void 364 dasd_proc_exit(void) 365 { 366 remove_proc_entry("devices", dasd_proc_root_entry); 367 remove_proc_entry("statistics", dasd_proc_root_entry); 368 remove_proc_entry("dasd", NULL); 369 } 370