kernel/blk_drv/scsi/scsi

/* */
This source file includes following definitions.
ioctl_probe
scsi_ioctl_done
ioctl_internal_command
ioctl_command
scsi_ioctl
   1 #include <linux/config.h>
   2 #ifdef CONFIG_SCSI 
   3 
   4 #include <asm/io.h>
   5 #include <asm/segment.h>
   6 #include <asm/system.h>
   7 
   8 #include <linux/errno.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <linux/string.h>
  12 
  13 #include "scsi.h"
  14 #include "hosts.h"
  15 #include "scsi_ioctl.h"
  16 
  17 #define MAX_RETRIES 5   
  18 #define MAX_TIMEOUT 200
  19 #define MAX_BUF 8192    
  20 
  21 #define max(a,b) (((a) > (b)) ? (a) : (b))
  22 
  23 /*
  24  * If we are told to probe a host, we will return 0 if  the host is not
  25  * present, 1 if the host is present, and will return an identifying
  26  * string at *arg, if arg is non null, filling to the length stored at
  27  * (int *) arg
  28  */
  29 
  30 static int ioctl_probe(int dev, void *buffer)
     /*  */
  31 {
  32         int temp;
  33         int len;
  34         
  35         if ((temp = scsi_hosts[dev].present) && buffer) {
  36                 len = get_fs_long ((int *) buffer);
  37                 memcpy_tofs (buffer, scsi_hosts[dev].info(), len);
  38         }
  39         return temp;
  40 }
  41 
  42 /*
  43  * 
  44  * The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host.
  45  * The MAX_TIMEOUT and MAX_RETRIES  variables are used.  
  46  * 
  47  * dev is the SCSI device struct ptr, *(int *) arg is the length of the
  48  * input data, if any, not including the command string & counts, 
  49  * *((int *)arg + 1) is the output buffer size in bytes.
  50  * 
  51  * *(char *) ((int *) arg)[2] the actual command byte.   
  52  * 
  53  * Note that no more than MAX_BUF data bytes will be transfered.  Since
  54  * SCSI block device size is 512 bytes, I figured 1K was good.
  55  * but (WDE) changed it to 8192 to handle large bad track buffers.
  56  * 
  57  * This size *does not* include the initial lengths that were passed.
  58  * 
  59  * The SCSI command is read from the memory location immediately after the
  60  * length words, and the input data is right after the command.  The SCSI
  61  * routines know the command size based on the opcode decode.  
  62  * 
  63  * The output area is then filled in starting from the command byte. 
  64  */
  65 
  66 static int the_result[MAX_SCSI_HOSTS] = {0,};
  67 
  68 static void scsi_ioctl_done (int host, int result)
     /*  */
  69 {
  70         the_result[host] = result;      
  71 }       
  72 
  73 /* This function will operate certain scsi functions which require no
  74    data transfer */
  75 static int ioctl_internal_command(Scsi_Device *dev, char ** command)
     /*  */
  76 {
  77         char * cmd;
  78         int temp, host;
  79         char sense_buffer[256];
  80 
  81         host = dev->host_no;
  82         cmd = command[0];
  83 
  84         do {
  85                 cli();
  86                 if (the_result[host]) {
  87                         sti();
  88                         while(the_result[host])
  89                                 /* nothing */;
  90                 } else {
  91                         the_result[host]=-1;
  92                         sti();
  93                         break;
  94                 }
  95         } while (1);
  96 
  97         scsi_do_cmd(host,  dev->id,  cmd,  NULL,  0,
  98                         scsi_ioctl_done,  MAX_TIMEOUT,
  99                         sense_buffer,  MAX_RETRIES);
 100 
 101         while (the_result[host] == -1)
 102                 /* nothing */;
 103         temp = the_result[host];
 104 
 105         if(driver_byte(the_result[host]) != 0)
 106           switch(sense_buffer[2] & 0xf) {
 107           case ILLEGAL_REQUEST:
 108             printk("SCSI device (ioctl) reports ILLEGAL REQUEST.\n");
 109             break;
 110           case NOT_READY: /* This happens if there is no disc in drive */
 111             if(dev->removable){
 112               printk("Device not ready.  Make sure there is a disc in the drive.\n");
 113               break;
 114             };
 115           case UNIT_ATTENTION:
 116             if (dev->removable){
 117               dev->changed = 1;
 118               temp = 0; /* This is no longer considered an error */
 119               printk("Disc change detected.\n");
 120               break;
 121             };
 122           default: /* Fall through for non-removable media */
 123             printk("SCSI CD error: host %d id %d lun %d return code = %x\n",
 124                    dev->host_no,
 125                    dev->id,
 126                    dev->lun,
 127                    the_result);
 128             printk("\tSense class %x, sense error %x, extended sense %x\n",
 129                    sense_class(sense_buffer[0]),
 130                    sense_error(sense_buffer[0]),
 131                    sense_buffer[2] & 0xf);
 132 
 133           };
 134 
 135         the_result[host] = 0;
 136         return temp;
 137 }
 138 
 139 static int ioctl_command(Scsi_Device *dev, void *buffer)
     /*  */
 140 {
 141         char buf[MAX_BUF];
 142         char cmd[10];
 143         char * cmd_in;
 144         unsigned char opcode;
 145         int inlen, outlen, cmdlen, temp, host;
 146 
 147         if (!buffer)
 148                 return -EINVAL;
 149         
 150         inlen = get_fs_long((int *) buffer);
 151         outlen = get_fs_long( ((int *) buffer) + 1);
 152 
 153         cmd_in = (char *) ( ((int *)buffer) + 2);
 154         opcode = get_fs_byte(cmd_in); 
 155 
 156         memcpy_fromfs ((void *) cmd,  cmd_in,  cmdlen = COMMAND_SIZE (opcode));
 157         memcpy_fromfs ((void *) buf,  (void *) (cmd_in + cmdlen),  inlen);
 158         host = dev->host_no;
 159 
 160 #ifndef DEBUG_NO_CMD
 161         do {
 162                 cli();
 163                 if (the_result[host]) {
 164                         sti();
 165                         while(the_result[host])
 166                                 /* nothing */;
 167                 } else {
 168                         the_result[host]=-1;
 169                         sti();
 170                         break;
 171                 }
 172         } while (1);
 173         
 174         scsi_do_cmd(host,  dev->id,  cmd,  buf,  ((outlen > MAX_BUF) ? 
 175                         MAX_BUF : outlen),  scsi_ioctl_done,  MAX_TIMEOUT, 
 176                         buf,  MAX_RETRIES);
 177 
 178         while (the_result[host] == -1)
 179                 /* nothing */;
 180         temp = the_result[host];
 181         the_result[host] = 0;
 182         memcpy_tofs ((void *) cmd_in,  buf,  (outlen > MAX_BUF) ? MAX_BUF  : outlen);
 183         return temp;
 184 #else
 185         {
 186         int i;
 187         printk("scsi_ioctl : device %d.  command = ", dev->id);
 188         for (i = 0; i < 10; ++i)
 189                 printk("%02x ", cmd[i]);
 190         printk("\r\nbuffer =");
 191         for (i = 0; i < 20; ++i)
 192                 printk("%02x ", buf[i]);
 193         printk("\r\n");
 194         printk("inlen = %d, outlen = %d, cmdlen = %d\n",
 195                 inlen, outlen, cmdlen);
 196         printk("buffer = %d, cmd_in = %d\n", buffer, cmd_in);
 197         }
 198         return 0;
 199 #endif
 200 }
 201 
 202         
 203 /*
 204         the scsi_ioctl() function differs from most ioctls in that it does
 205         not take a major/minor number as the dev filed.  Rather, it takes
 206         a pointer to a scsi_devices[] element, a structure. 
 207 */
 208 int scsi_ioctl (Scsi_Device *dev, int cmd, void *arg)
     /*  */
 209 {
 210         char scsi_cmd[10];
 211         char * command[2];
 212 
 213         if ((cmd != 0 && dev->id > NR_SCSI_DEVICES))
 214                 return -ENODEV;
 215         if ((cmd == 0 && dev->host_no > MAX_SCSI_HOSTS))
 216                 return -ENODEV;
 217         
 218         switch (cmd) {
 219                 case SCSI_IOCTL_PROBE_HOST:
 220                         return ioctl_probe(dev->host_no, arg);
 221                 case SCSI_IOCTL_SEND_COMMAND:
 222                         return ioctl_command((Scsi_Device *) dev, arg);
 223                 case SCSI_IOCTL_DOORLOCK:
 224                         if (!dev->removable) return 0;
 225                         scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
 226                         scsi_cmd[1] = dev->lun << 5;
 227                         scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
 228                         scsi_cmd[4] = SCSI_REMOVAL_PREVENT;
 229                         command[0] = scsi_cmd;
 230                         return ioctl_internal_command((Scsi_Device *) dev, command);
 231                         break;
 232                 case SCSI_IOCTL_DOORUNLOCK:
 233                         if (!dev->removable) return 0;
 234                         scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
 235                         scsi_cmd[1] = dev->lun << 5;
 236                         scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
 237                         scsi_cmd[4] = SCSI_REMOVAL_ALLOW;
 238                         command[0] = scsi_cmd;
 239                         return ioctl_internal_command((Scsi_Device *) dev, command);
 240                 case SCSI_IOCTL_TEST_UNIT_READY:
 241                         scsi_cmd[0] = TEST_UNIT_READY;
 242                         scsi_cmd[1] = dev->lun << 5;
 243                         scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
 244                         scsi_cmd[4] = 0;
 245                         command[0] = scsi_cmd;
 246                         return ioctl_internal_command((Scsi_Device *) dev, command);
 247                         break;
 248                 default :                       
 249                         return -EINVAL;
 250         }
 251 }
 252 #endif
/* */
root/kernel/blk_drv/scsi/scsi_ioctl.c

DEFINITIONS
