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