1 /* 2 * linux/drivers/scsi/scsi_proc.c 3 * 4 * The functions in this file provide an interface between 5 * the PROC file system and the SCSI device drivers 6 * It is mainly used for debugging, statistics and to pass 7 * information directly to the lowlevel driver. 8 * 9 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de 10 * Version: 0.99.8 last change: 95/09/13 11 * 12 * generic command parser provided by: 13 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de> 14 * 15 * generic_proc_info() support of xxxx_info() by: 16 * Michael A. Griffith <grif@acm.org> 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/string.h> 22 #include <linux/mm.h> 23 #include <linux/slab.h> 24 #include <linux/proc_fs.h> 25 #include <linux/errno.h> 26 #include <linux/blkdev.h> 27 #include <linux/seq_file.h> 28 #include <linux/mutex.h> 29 #include <asm/uaccess.h> 30 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_host.h> 34 #include <scsi/scsi_transport.h> 35 36 #include "scsi_priv.h" 37 #include "scsi_logging.h" 38 39 40 /* 4K page size, but our output routines, use some slack for overruns */ 41 #define PROC_BLOCK_SIZE (3*1024) 42 43 static struct proc_dir_entry *proc_scsi; 44 45 /* Protect sht->present and sht->proc_dir */ 46 static DEFINE_MUTEX(global_host_template_mutex); 47 48 static int proc_scsi_read(char *buffer, char **start, off_t offset, 49 int length, int *eof, void *data) 50 { 51 struct Scsi_Host *shost = data; 52 int n; 53 54 n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0); 55 *eof = (n < length); 56 57 return n; 58 } 59 60 static int proc_scsi_write_proc(struct file *file, const char __user *buf, 61 unsigned long count, void *data) 62 { 63 struct Scsi_Host *shost = data; 64 ssize_t ret = -ENOMEM; 65 char *page; 66 char *start; 67 68 if (count > PROC_BLOCK_SIZE) 69 return -EOVERFLOW; 70 71 page = (char *)__get_free_page(GFP_KERNEL); 72 if (page) { 73 ret = -EFAULT; 74 if (copy_from_user(page, buf, count)) 75 goto out; 76 ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1); 77 } 78 out: 79 free_page((unsigned long)page); 80 return ret; 81 } 82 83 void scsi_proc_hostdir_add(struct scsi_host_template *sht) 84 { 85 if (!sht->proc_info) 86 return; 87 88 mutex_lock(&global_host_template_mutex); 89 if (!sht->present++) { 90 sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi); 91 if (!sht->proc_dir) 92 printk(KERN_ERR "%s: proc_mkdir failed for %s\n", 93 __FUNCTION__, sht->proc_name); 94 else 95 sht->proc_dir->owner = sht->module; 96 } 97 mutex_unlock(&global_host_template_mutex); 98 } 99 100 void scsi_proc_hostdir_rm(struct scsi_host_template *sht) 101 { 102 if (!sht->proc_info) 103 return; 104 105 mutex_lock(&global_host_template_mutex); 106 if (!--sht->present && sht->proc_dir) { 107 remove_proc_entry(sht->proc_name, proc_scsi); 108 sht->proc_dir = NULL; 109 } 110 mutex_unlock(&global_host_template_mutex); 111 } 112 113 void scsi_proc_host_add(struct Scsi_Host *shost) 114 { 115 struct scsi_host_template *sht = shost->hostt; 116 struct proc_dir_entry *p; 117 char name[10]; 118 119 if (!sht->proc_dir) 120 return; 121 122 sprintf(name,"%d", shost->host_no); 123 p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR, 124 sht->proc_dir, proc_scsi_read, shost); 125 if (!p) { 126 printk(KERN_ERR "%s: Failed to register host %d in" 127 "%s\n", __FUNCTION__, shost->host_no, 128 sht->proc_name); 129 return; 130 } 131 132 p->write_proc = proc_scsi_write_proc; 133 p->owner = sht->module; 134 } 135 136 void scsi_proc_host_rm(struct Scsi_Host *shost) 137 { 138 char name[10]; 139 140 if (!shost->hostt->proc_dir) 141 return; 142 143 sprintf(name,"%d", shost->host_no); 144 remove_proc_entry(name, shost->hostt->proc_dir); 145 } 146 147 static int proc_print_scsidevice(struct device *dev, void *data) 148 { 149 struct scsi_device *sdev = to_scsi_device(dev); 150 struct seq_file *s = data; 151 int i; 152 153 seq_printf(s, 154 "Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ", 155 sdev->host->host_no, sdev->channel, sdev->id, sdev->lun); 156 for (i = 0; i < 8; i++) { 157 if (sdev->vendor[i] >= 0x20) 158 seq_printf(s, "%c", sdev->vendor[i]); 159 else 160 seq_printf(s, " "); 161 } 162 163 seq_printf(s, " Model: "); 164 for (i = 0; i < 16; i++) { 165 if (sdev->model[i] >= 0x20) 166 seq_printf(s, "%c", sdev->model[i]); 167 else 168 seq_printf(s, " "); 169 } 170 171 seq_printf(s, " Rev: "); 172 for (i = 0; i < 4; i++) { 173 if (sdev->rev[i] >= 0x20) 174 seq_printf(s, "%c", sdev->rev[i]); 175 else 176 seq_printf(s, " "); 177 } 178 179 seq_printf(s, "\n"); 180 181 seq_printf(s, " Type: %s ", 182 sdev->type < MAX_SCSI_DEVICE_CODE ? 183 scsi_device_types[(int) sdev->type] : "Unknown "); 184 seq_printf(s, " ANSI" 185 " SCSI revision: %02x", (sdev->scsi_level - 1) ? 186 sdev->scsi_level - 1 : 1); 187 if (sdev->scsi_level == 2) 188 seq_printf(s, " CCS\n"); 189 else 190 seq_printf(s, "\n"); 191 192 return 0; 193 } 194 195 static int scsi_add_single_device(uint host, uint channel, uint id, uint lun) 196 { 197 struct Scsi_Host *shost; 198 int error = -ENXIO; 199 200 shost = scsi_host_lookup(host); 201 if (IS_ERR(shost)) 202 return PTR_ERR(shost); 203 204 if (shost->transportt->user_scan) 205 error = shost->transportt->user_scan(shost, channel, id, lun); 206 else 207 error = scsi_scan_host_selected(shost, channel, id, lun, 1); 208 scsi_host_put(shost); 209 return error; 210 } 211 212 static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun) 213 { 214 struct scsi_device *sdev; 215 struct Scsi_Host *shost; 216 int error = -ENXIO; 217 218 shost = scsi_host_lookup(host); 219 if (IS_ERR(shost)) 220 return PTR_ERR(shost); 221 sdev = scsi_device_lookup(shost, channel, id, lun); 222 if (sdev) { 223 scsi_remove_device(sdev); 224 scsi_device_put(sdev); 225 error = 0; 226 } 227 228 scsi_host_put(shost); 229 return error; 230 } 231 232 static ssize_t proc_scsi_write(struct file *file, const char __user *buf, 233 size_t length, loff_t *ppos) 234 { 235 int host, channel, id, lun; 236 char *buffer, *p; 237 int err; 238 239 if (!buf || length > PAGE_SIZE) 240 return -EINVAL; 241 242 buffer = (char *)__get_free_page(GFP_KERNEL); 243 if (!buffer) 244 return -ENOMEM; 245 246 err = -EFAULT; 247 if (copy_from_user(buffer, buf, length)) 248 goto out; 249 250 err = -EINVAL; 251 if (length < PAGE_SIZE) 252 buffer[length] = '\0'; 253 else if (buffer[PAGE_SIZE-1]) 254 goto out; 255 256 /* 257 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi 258 * with "0 1 2 3" replaced by your "Host Channel Id Lun". 259 */ 260 if (!strncmp("scsi add-single-device", buffer, 22)) { 261 p = buffer + 23; 262 263 host = simple_strtoul(p, &p, 0); 264 channel = simple_strtoul(p + 1, &p, 0); 265 id = simple_strtoul(p + 1, &p, 0); 266 lun = simple_strtoul(p + 1, &p, 0); 267 268 err = scsi_add_single_device(host, channel, id, lun); 269 270 /* 271 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi 272 * with "0 1 2 3" replaced by your "Host Channel Id Lun". 273 */ 274 } else if (!strncmp("scsi remove-single-device", buffer, 25)) { 275 p = buffer + 26; 276 277 host = simple_strtoul(p, &p, 0); 278 channel = simple_strtoul(p + 1, &p, 0); 279 id = simple_strtoul(p + 1, &p, 0); 280 lun = simple_strtoul(p + 1, &p, 0); 281 282 err = scsi_remove_single_device(host, channel, id, lun); 283 } 284 285 /* 286 * convert success returns so that we return the 287 * number of bytes consumed. 288 */ 289 if (!err) 290 err = length; 291 292 out: 293 free_page((unsigned long)buffer); 294 return err; 295 } 296 297 static int proc_scsi_show(struct seq_file *s, void *p) 298 { 299 seq_printf(s, "Attached devices:\n"); 300 bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice); 301 return 0; 302 } 303 304 static int proc_scsi_open(struct inode *inode, struct file *file) 305 { 306 /* 307 * We don't really needs this for the write case but it doesn't 308 * harm either. 309 */ 310 return single_open(file, proc_scsi_show, NULL); 311 } 312 313 static struct file_operations proc_scsi_operations = { 314 .open = proc_scsi_open, 315 .read = seq_read, 316 .write = proc_scsi_write, 317 .llseek = seq_lseek, 318 .release = single_release, 319 }; 320 321 int __init scsi_init_procfs(void) 322 { 323 struct proc_dir_entry *pde; 324 325 proc_scsi = proc_mkdir("scsi", NULL); 326 if (!proc_scsi) 327 goto err1; 328 329 pde = create_proc_entry("scsi/scsi", 0, NULL); 330 if (!pde) 331 goto err2; 332 pde->proc_fops = &proc_scsi_operations; 333 334 return 0; 335 336 err2: 337 remove_proc_entry("scsi", NULL); 338 err1: 339 return -ENOMEM; 340 } 341 342 void scsi_exit_procfs(void) 343 { 344 remove_proc_entry("scsi/scsi", NULL); 345 remove_proc_entry("scsi", NULL); 346 } 347