drivers/scsi/scsi_proc.c

   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 ", scsi_device_type(sdev->type));
 182         seq_printf(s, "               ANSI  SCSI revision: %02x",
 183                         sdev->scsi_level - (sdev->scsi_level > 1));
 184         if (sdev->scsi_level == 2)
 185                 seq_printf(s, " CCS\n");
 186         else
 187                 seq_printf(s, "\n");
 188
 189         return 0;
 190 }
 191
 192 static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
 193 {
 194         struct Scsi_Host *shost;
 195         int error = -ENXIO;
 196
 197         shost = scsi_host_lookup(host);
 198         if (IS_ERR(shost))
 199                 return PTR_ERR(shost);
 200
 201         if (shost->transportt->user_scan)
 202                 error = shost->transportt->user_scan(shost, channel, id, lun);
 203         else
 204                 error = scsi_scan_host_selected(shost, channel, id, lun, 1);
 205         scsi_host_put(shost);
 206         return error;
 207 }
 208
 209 static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
 210 {
 211         struct scsi_device *sdev;
 212         struct Scsi_Host *shost;
 213         int error = -ENXIO;
 214
 215         shost = scsi_host_lookup(host);
 216         if (IS_ERR(shost))
 217                 return PTR_ERR(shost);
 218         sdev = scsi_device_lookup(shost, channel, id, lun);
 219         if (sdev) {
 220                 scsi_remove_device(sdev);
 221                 scsi_device_put(sdev);
 222                 error = 0;
 223         }
 224
 225         scsi_host_put(shost);
 226         return error;
 227 }
 228
 229 static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
 230                                size_t length, loff_t *ppos)
 231 {
 232         int host, channel, id, lun;
 233         char *buffer, *p;
 234         int err;
 235
 236         if (!buf || length > PAGE_SIZE)
 237                 return -EINVAL;
 238
 239         buffer = (char *)__get_free_page(GFP_KERNEL);
 240         if (!buffer)
 241                 return -ENOMEM;
 242
 243         err = -EFAULT;
 244         if (copy_from_user(buffer, buf, length))
 245                 goto out;
 246
 247         err = -EINVAL;
 248         if (length < PAGE_SIZE)
 249                 buffer[length] = '\0';
 250         else if (buffer[PAGE_SIZE-1])
 251                 goto out;
 252
 253         /*
 254          * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
 255          * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
 256          */
 257         if (!strncmp("scsi add-single-device", buffer, 22)) {
 258                 p = buffer + 23;
 259
 260                 host = simple_strtoul(p, &p, 0);
 261                 channel = simple_strtoul(p + 1, &p, 0);
 262                 id = simple_strtoul(p + 1, &p, 0);
 263                 lun = simple_strtoul(p + 1, &p, 0);
 264
 265                 err = scsi_add_single_device(host, channel, id, lun);
 266
 267         /*
 268          * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
 269          * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
 270          */
 271         } else if (!strncmp("scsi remove-single-device", buffer, 25)) {
 272                 p = buffer + 26;
 273
 274                 host = simple_strtoul(p, &p, 0);
 275                 channel = simple_strtoul(p + 1, &p, 0);
 276                 id = simple_strtoul(p + 1, &p, 0);
 277                 lun = simple_strtoul(p + 1, &p, 0);
 278
 279                 err = scsi_remove_single_device(host, channel, id, lun);
 280         }
 281
 282         /*
 283          * convert success returns so that we return the
 284          * number of bytes consumed.
 285          */
 286         if (!err)
 287                 err = length;
 288
 289  out:
 290         free_page((unsigned long)buffer);
 291         return err;
 292 }
 293
 294 static int proc_scsi_show(struct seq_file *s, void *p)
 295 {
 296         seq_printf(s, "Attached devices:\n");
 297         bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
 298         return 0;
 299 }
 300
 301 static int proc_scsi_open(struct inode *inode, struct file *file)
 302 {
 303         /*
 304          * We don't really needs this for the write case but it doesn't
 305          * harm either.
 306          */
 307         return single_open(file, proc_scsi_show, NULL);
 308 }
 309
 310 static const struct file_operations proc_scsi_operations = {
 311         .open           = proc_scsi_open,
 312         .read           = seq_read,
 313         .write          = proc_scsi_write,
 314         .llseek         = seq_lseek,
 315         .release        = single_release,
 316 };
 317
 318 int __init scsi_init_procfs(void)
 319 {
 320         struct proc_dir_entry *pde;
 321
 322         proc_scsi = proc_mkdir("scsi", NULL);
 323         if (!proc_scsi)
 324                 goto err1;
 325
 326         pde = create_proc_entry("scsi/scsi", 0, NULL);
 327         if (!pde)
 328                 goto err2;
 329         pde->proc_fops = &proc_scsi_operations;
 330
 331         return 0;
 332
 333 err2:
 334         remove_proc_entry("scsi", NULL);
 335 err1:
 336         return -ENOMEM;
 337 }
 338
 339 void scsi_exit_procfs(void)
 340 {
 341         remove_proc_entry("scsi/scsi", NULL);
 342         remove_proc_entry("scsi", NULL);
 343 }