drivers/scsi/sr_ioctl.c

   1 #include <linux/kernel.h>
   2 #include <linux/sched.h>
   3 #include <linux/mm.h>
   4 #include <linux/fs.h>
   5 #include <linux/errno.h>
   6 #include <linux/string.h>
   7 #include <linux/blkdev.h>
   8 #include <linux/blkpg.h>
   9 #include <linux/cdrom.h>
  10 #include <linux/delay.h>
  11 #include <asm/io.h>
  12 #include <asm/uaccess.h>
  13
  14 #include <scsi/scsi.h>
  15 #include <scsi/scsi_dbg.h>
  16 #include <scsi/scsi_device.h>
  17 #include <scsi/scsi_eh.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_ioctl.h>
  20 #include <scsi/scsi_request.h>
  21
  22 #include "sr.h"
  23
  24 #if 0
  25 #define DEBUG
  26 #endif
  27
  28 /* The sr_is_xa() seems to trigger firmware bugs with some drives :-(
  29  * It is off by default and can be turned on with this module parameter */
  30 static int xa_test = 0;
  31
  32 module_param(xa_test, int, S_IRUGO | S_IWUSR);
  33
  34
  35 #define IOCTL_RETRIES 3
  36
  37 /* ATAPI drives don't have a SCMD_PLAYAUDIO_TI command.  When these drives
  38    are emulating a SCSI device via the idescsi module, they need to have
  39    CDROMPLAYTRKIND commands translated into CDROMPLAYMSF commands for them */
  40
  41 static int sr_fake_playtrkind(struct cdrom_device_info *cdi, struct cdrom_ti *ti)
  42 {
  43         struct cdrom_tocentry trk0_te, trk1_te;
  44         struct cdrom_tochdr tochdr;
  45         struct packet_command cgc;
  46         int ntracks, ret;
  47
  48         if ((ret = sr_audio_ioctl(cdi, CDROMREADTOCHDR, &tochdr)))
  49                 return ret;
  50
  51         ntracks = tochdr.cdth_trk1 - tochdr.cdth_trk0 + 1;
  52
  53         if (ti->cdti_trk1 == ntracks)
  54                 ti->cdti_trk1 = CDROM_LEADOUT;
  55         else if (ti->cdti_trk1 != CDROM_LEADOUT)
  56                 ti->cdti_trk1 ++;
  57
  58         trk0_te.cdte_track = ti->cdti_trk0;
  59         trk0_te.cdte_format = CDROM_MSF;
  60         trk1_te.cdte_track = ti->cdti_trk1;
  61         trk1_te.cdte_format = CDROM_MSF;
  62
  63         if ((ret = sr_audio_ioctl(cdi, CDROMREADTOCENTRY, &trk0_te)))
  64                 return ret;
  65         if ((ret = sr_audio_ioctl(cdi, CDROMREADTOCENTRY, &trk1_te)))
  66                 return ret;
  67
  68         memset(&cgc, 0, sizeof(struct packet_command));
  69         cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
  70         cgc.cmd[3] = trk0_te.cdte_addr.msf.minute;
  71         cgc.cmd[4] = trk0_te.cdte_addr.msf.second;
  72         cgc.cmd[5] = trk0_te.cdte_addr.msf.frame;
  73         cgc.cmd[6] = trk1_te.cdte_addr.msf.minute;
  74         cgc.cmd[7] = trk1_te.cdte_addr.msf.second;
  75         cgc.cmd[8] = trk1_te.cdte_addr.msf.frame;
  76         cgc.data_direction = DMA_NONE;
  77         cgc.timeout = IOCTL_TIMEOUT;
  78         return sr_do_ioctl(cdi->handle, &cgc);
  79 }
  80
  81 /* We do our own retries because we want to know what the specific
  82    error code is.  Normally the UNIT_ATTENTION code will automatically
  83    clear after one error */
  84
  85 int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
  86 {
  87         struct scsi_request *SRpnt;
  88         struct scsi_device *SDev;
  89         struct request *req;
  90         int result, err = 0, retries = 0;
  91
  92         SDev = cd->device;
  93         SRpnt = scsi_allocate_request(SDev, GFP_KERNEL);
  94         if (!SRpnt) {
  95                 printk(KERN_ERR "Unable to allocate SCSI request in sr_do_ioctl");
  96                 err = -ENOMEM;
  97                 goto out;
  98         }
  99         SRpnt->sr_data_direction = cgc->data_direction;
 100
 101       retry:
 102         if (!scsi_block_when_processing_errors(SDev)) {
 103                 err = -ENODEV;
 104                 goto out_free;
 105         }
 106
 107         scsi_wait_req(SRpnt, cgc->cmd, cgc->buffer, cgc->buflen,
 108                       cgc->timeout, IOCTL_RETRIES);
 109
 110         req = SRpnt->sr_request;
 111         if (SRpnt->sr_buffer && req->buffer && SRpnt->sr_buffer != req->buffer) {
 112                 memcpy(req->buffer, SRpnt->sr_buffer, SRpnt->sr_bufflen);
 113                 kfree(SRpnt->sr_buffer);
 114                 SRpnt->sr_buffer = req->buffer;
 115         }
 116
 117         result = SRpnt->sr_result;
 118
 119         /* Minimal error checking.  Ignore cases we know about, and report the rest. */
 120         if (driver_byte(result) != 0) {
 121                 switch (SRpnt->sr_sense_buffer[2] & 0xf) {
 122                 case UNIT_ATTENTION:
 123                         SDev->changed = 1;
 124                         if (!cgc->quiet)
 125                                 printk(KERN_INFO "%s: disc change detected.\n", cd->cdi.name);
 126                         if (retries++ < 10)
 127                                 goto retry;
 128                         err = -ENOMEDIUM;
 129                         break;
 130                 case NOT_READY: /* This happens if there is no disc in drive */
 131                         if (SRpnt->sr_sense_buffer[12] == 0x04 &&
 132                             SRpnt->sr_sense_buffer[13] == 0x01) {
 133                                 /* sense: Logical unit is in process of becoming ready */
 134                                 if (!cgc->quiet)
 135                                         printk(KERN_INFO "%s: CDROM not ready yet.\n", cd->cdi.name);
 136                                 if (retries++ < 10) {
 137                                         /* sleep 2 sec and try again */
 138                                         ssleep(2);
 139                                         goto retry;
 140                                 } else {
 141                                         /* 20 secs are enough? */
 142                                         err = -ENOMEDIUM;
 143                                         break;
 144                                 }
 145                         }
 146                         if (!cgc->quiet)
 147                                 printk(KERN_INFO "%s: CDROM not ready.  Make sure there is a disc in the drive.\n", cd->cdi.name);
 148 #ifdef DEBUG
 149                         scsi_print_req_sense("sr", SRpnt);
 150 #endif
 151                         err = -ENOMEDIUM;
 152                         break;
 153                 case ILLEGAL_REQUEST:
 154                         err = -EIO;
 155                         if (SRpnt->sr_sense_buffer[12] == 0x20 &&
 156                             SRpnt->sr_sense_buffer[13] == 0x00)
 157                                 /* sense: Invalid command operation code */
 158                                 err = -EDRIVE_CANT_DO_THIS;
 159 #ifdef DEBUG
 160                         __scsi_print_command(cgc->cmd);
 161                         scsi_print_req_sense("sr", SRpnt);
 162 #endif
 163                         break;
 164                 default:
 165                         printk(KERN_ERR "%s: CDROM (ioctl) error, command: ", cd->cdi.name);
 166                         __scsi_print_command(cgc->cmd);
 167                         scsi_print_req_sense("sr", SRpnt);
 168                         err = -EIO;
 169                 }
 170         }
 171
 172         if (cgc->sense)
 173                 memcpy(cgc->sense, SRpnt->sr_sense_buffer, sizeof(*cgc->sense));
 174
 175         /* Wake up a process waiting for device */
 176       out_free:
 177         scsi_release_request(SRpnt);
 178         SRpnt = NULL;
 179       out:
 180         cgc->stat = err;
 181         return err;
 182 }
 183
 184 /* ---------------------------------------------------------------------- */
 185 /* interface to cdrom.c                                                   */
 186
 187 static int test_unit_ready(Scsi_CD *cd)
 188 {
 189         struct packet_command cgc;
 190
 191         memset(&cgc, 0, sizeof(struct packet_command));
 192         cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
 193         cgc.quiet = 1;
 194         cgc.data_direction = DMA_NONE;
 195         cgc.timeout = IOCTL_TIMEOUT;
 196         return sr_do_ioctl(cd, &cgc);
 197 }
 198
 199 int sr_tray_move(struct cdrom_device_info *cdi, int pos)
 200 {
 201         Scsi_CD *cd = cdi->handle;
 202         struct packet_command cgc;
 203
 204         memset(&cgc, 0, sizeof(struct packet_command));
 205         cgc.cmd[0] = GPCMD_START_STOP_UNIT;
 206         cgc.cmd[4] = (pos == 0) ? 0x03 /* close */ : 0x02 /* eject */ ;
 207         cgc.data_direction = DMA_NONE;
 208         cgc.timeout = IOCTL_TIMEOUT;
 209         return sr_do_ioctl(cd, &cgc);
 210 }
 211
 212 int sr_lock_door(struct cdrom_device_info *cdi, int lock)
 213 {
 214         Scsi_CD *cd = cdi->handle;
 215
 216         return scsi_set_medium_removal(cd->device, lock ?
 217                        SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
 218 }
 219
 220 int sr_drive_status(struct cdrom_device_info *cdi, int slot)
 221 {
 222         if (CDSL_CURRENT != slot) {
 223                 /* we have no changer support */
 224                 return -EINVAL;
 225         }
 226         if (0 == test_unit_ready(cdi->handle))
 227                 return CDS_DISC_OK;
 228
 229         return CDS_TRAY_OPEN;
 230 }
 231
 232 int sr_disk_status(struct cdrom_device_info *cdi)
 233 {
 234         Scsi_CD *cd = cdi->handle;
 235         struct cdrom_tochdr toc_h;
 236         struct cdrom_tocentry toc_e;
 237         int i, rc, have_datatracks = 0;
 238
 239         /* look for data tracks */
 240         if (0 != (rc = sr_audio_ioctl(cdi, CDROMREADTOCHDR, &toc_h)))
 241                 return (rc == -ENOMEDIUM) ? CDS_NO_DISC : CDS_NO_INFO;
 242
 243         for (i = toc_h.cdth_trk0; i <= toc_h.cdth_trk1; i++) {
 244                 toc_e.cdte_track = i;
 245                 toc_e.cdte_format = CDROM_LBA;
 246                 if (sr_audio_ioctl(cdi, CDROMREADTOCENTRY, &toc_e))
 247                         return CDS_NO_INFO;
 248                 if (toc_e.cdte_ctrl & CDROM_DATA_TRACK) {
 249                         have_datatracks = 1;
 250                         break;
 251                 }
 252         }
 253         if (!have_datatracks)
 254                 return CDS_AUDIO;
 255
 256         if (cd->xa_flag)
 257                 return CDS_XA_2_1;
 258         else
 259                 return CDS_DATA_1;
 260 }
 261
 262 int sr_get_last_session(struct cdrom_device_info *cdi,
 263                         struct cdrom_multisession *ms_info)
 264 {
 265         Scsi_CD *cd = cdi->handle;
 266
 267         ms_info->addr.lba = cd->ms_offset;
 268         ms_info->xa_flag = cd->xa_flag || cd->ms_offset > 0;
 269
 270         return 0;
 271 }
 272
 273 /* primitive to determine whether we need to have GFP_DMA set based on
 274  * the status of the unchecked_isa_dma flag in the host structure */
 275 #define SR_GFP_DMA(cd) (((cd)->device->host->unchecked_isa_dma) ? GFP_DMA : 0)
 276
 277 int sr_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
 278 {
 279         Scsi_CD *cd = cdi->handle;
 280         struct packet_command cgc;
 281         char *buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
 282         int result;
 283
 284         memset(&cgc, 0, sizeof(struct packet_command));
 285         cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
 286         cgc.cmd[2] = 0x40;      /* I do want the subchannel info */
 287         cgc.cmd[3] = 0x02;      /* Give me medium catalog number info */
 288         cgc.cmd[8] = 24;
 289         cgc.buffer = buffer;
 290         cgc.buflen = 24;
 291         cgc.data_direction = DMA_FROM_DEVICE;
 292         cgc.timeout = IOCTL_TIMEOUT;
 293         result = sr_do_ioctl(cd, &cgc);
 294
 295         memcpy(mcn->medium_catalog_number, buffer + 9, 13);
 296         mcn->medium_catalog_number[13] = 0;
 297
 298         kfree(buffer);
 299         return result;
 300 }
 301
 302 int sr_reset(struct cdrom_device_info *cdi)
 303 {
 304         return 0;
 305 }
 306
 307 int sr_select_speed(struct cdrom_device_info *cdi, int speed)
 308 {
 309         Scsi_CD *cd = cdi->handle;
 310         struct packet_command cgc;
 311
 312         if (speed == 0)
 313                 speed = 0xffff; /* set to max */
 314         else
 315                 speed *= 177;   /* Nx to kbyte/s */
 316
 317         memset(&cgc, 0, sizeof(struct packet_command));
 318         cgc.cmd[0] = GPCMD_SET_SPEED;   /* SET CD SPEED */
 319         cgc.cmd[2] = (speed >> 8) & 0xff;       /* MSB for speed (in kbytes/sec) */
 320         cgc.cmd[3] = speed & 0xff;      /* LSB */
 321         cgc.data_direction = DMA_NONE;
 322         cgc.timeout = IOCTL_TIMEOUT;
 323
 324         if (sr_do_ioctl(cd, &cgc))
 325                 return -EIO;
 326         return 0;
 327 }
 328
 329 /* ----------------------------------------------------------------------- */
 330 /* this is called by the generic cdrom driver. arg is a _kernel_ pointer,  */
 331 /* because the generic cdrom driver does the user access stuff for us.     */
 332 /* only cdromreadtochdr and cdromreadtocentry are left - for use with the  */
 333 /* sr_disk_status interface for the generic cdrom driver.                  */
 334
 335 int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
 336 {
 337         Scsi_CD *cd = cdi->handle;
 338         struct packet_command cgc;
 339         int result;
 340         unsigned char *buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
 341
 342         if (!buffer)
 343                 return -ENOMEM;
 344
 345         memset(&cgc, 0, sizeof(struct packet_command));
 346         cgc.timeout = IOCTL_TIMEOUT;
 347
 348         switch (cmd) {
 349         case CDROMREADTOCHDR:
 350                 {
 351                         struct cdrom_tochdr *tochdr = (struct cdrom_tochdr *) arg;
 352
 353                         cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
 354                         cgc.cmd[8] = 12;                /* LSB of length */
 355                         cgc.buffer = buffer;
 356                         cgc.buflen = 12;
 357                         cgc.quiet = 1;
 358                         cgc.data_direction = DMA_FROM_DEVICE;
 359
 360                         result = sr_do_ioctl(cd, &cgc);
 361
 362                         tochdr->cdth_trk0 = buffer[2];
 363                         tochdr->cdth_trk1 = buffer[3];
 364
 365                         break;
 366                 }
 367
 368         case CDROMREADTOCENTRY:
 369                 {
 370                         struct cdrom_tocentry *tocentry = (struct cdrom_tocentry *) arg;
 371
 372                         cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
 373                         cgc.cmd[1] |= (tocentry->cdte_format == CDROM_MSF) ? 0x02 : 0;
 374                         cgc.cmd[6] = tocentry->cdte_track;
 375                         cgc.cmd[8] = 12;                /* LSB of length */
 376                         cgc.buffer = buffer;
 377                         cgc.buflen = 12;
 378                         cgc.data_direction = DMA_FROM_DEVICE;
 379
 380                         result = sr_do_ioctl(cd, &cgc);
 381
 382                         tocentry->cdte_ctrl = buffer[5] & 0xf;
 383                         tocentry->cdte_adr = buffer[5] >> 4;
 384                         tocentry->cdte_datamode = (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
 385                         if (tocentry->cdte_format == CDROM_MSF) {
 386                                 tocentry->cdte_addr.msf.minute = buffer[9];
 387                                 tocentry->cdte_addr.msf.second = buffer[10];
 388                                 tocentry->cdte_addr.msf.frame = buffer[11];
 389                         } else
 390                                 tocentry->cdte_addr.lba = (((((buffer[8] << 8) + buffer[9]) << 8)
 391                                         + buffer[10]) << 8) + buffer[11];
 392
 393                         break;
 394                 }
 395
 396         case CDROMPLAYTRKIND: {
 397                 struct cdrom_ti* ti = (struct cdrom_ti*)arg;
 398
 399                 cgc.cmd[0] = GPCMD_PLAYAUDIO_TI;
 400                 cgc.cmd[4] = ti->cdti_trk0;
 401                 cgc.cmd[5] = ti->cdti_ind0;
 402                 cgc.cmd[7] = ti->cdti_trk1;
 403                 cgc.cmd[8] = ti->cdti_ind1;
 404                 cgc.data_direction = DMA_NONE;
 405
 406                 result = sr_do_ioctl(cd, &cgc);
 407                 if (result == -EDRIVE_CANT_DO_THIS)
 408                         result = sr_fake_playtrkind(cdi, ti);
 409
 410                 break;
 411         }
 412
 413         default:
 414                 result = -EINVAL;
 415         }
 416
 417 #if 0
 418         if (result)
 419                 printk("DEBUG: sr_audio: result for ioctl %x: %x\n", cmd, result);
 420 #endif
 421
 422         kfree(buffer);
 423         return result;
 424 }
 425
 426 /* -----------------------------------------------------------------------
 427  * a function to read all sorts of funny cdrom sectors using the READ_CD
 428  * scsi-3 mmc command
 429  *
 430  * lba:     linear block address
 431  * format:  0 = data (anything)
 432  *          1 = audio
 433  *          2 = data (mode 1)
 434  *          3 = data (mode 2)
 435  *          4 = data (mode 2 form1)
 436  *          5 = data (mode 2 form2)
 437  * blksize: 2048 | 2336 | 2340 | 2352
 438  */
 439
 440 static int sr_read_cd(Scsi_CD *cd, unsigned char *dest, int lba, int format, int blksize)
 441 {
 442         struct packet_command cgc;
 443
 444 #ifdef DEBUG
 445         printk("%s: sr_read_cd lba=%d format=%d blksize=%d\n",
 446                cd->cdi.name, lba, format, blksize);
 447 #endif
 448
 449         memset(&cgc, 0, sizeof(struct packet_command));
 450         cgc.cmd[0] = GPCMD_READ_CD;     /* READ_CD */
 451         cgc.cmd[1] = ((format & 7) << 2);
 452         cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
 453         cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
 454         cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
 455         cgc.cmd[5] = (unsigned char) lba & 0xff;
 456         cgc.cmd[8] = 1;
 457         switch (blksize) {
 458         case 2336:
 459                 cgc.cmd[9] = 0x58;
 460                 break;
 461         case 2340:
 462                 cgc.cmd[9] = 0x78;
 463                 break;
 464         case 2352:
 465                 cgc.cmd[9] = 0xf8;
 466                 break;
 467         default:
 468                 cgc.cmd[9] = 0x10;
 469                 break;
 470         }
 471         cgc.buffer = dest;
 472         cgc.buflen = blksize;
 473         cgc.data_direction = DMA_FROM_DEVICE;
 474         cgc.timeout = IOCTL_TIMEOUT;
 475         return sr_do_ioctl(cd, &cgc);
 476 }
 477
 478 /*
 479  * read sectors with blocksizes other than 2048
 480  */
 481
 482 static int sr_read_sector(Scsi_CD *cd, int lba, int blksize, unsigned char *dest)
 483 {
 484         struct packet_command cgc;
 485         int rc;
 486
 487         /* we try the READ CD command first... */
 488         if (cd->readcd_known) {
 489                 rc = sr_read_cd(cd, dest, lba, 0, blksize);
 490                 if (-EDRIVE_CANT_DO_THIS != rc)
 491                         return rc;
 492                 cd->readcd_known = 0;
 493                 printk("CDROM does'nt support READ CD (0xbe) command\n");
 494                 /* fall & retry the other way */
 495         }
 496         /* ... if this fails, we switch the blocksize using MODE SELECT */
 497         if (blksize != cd->device->sector_size) {
 498                 if (0 != (rc = sr_set_blocklength(cd, blksize)))
 499                         return rc;
 500         }
 501 #ifdef DEBUG
 502         printk("%s: sr_read_sector lba=%d blksize=%d\n", cd->cdi.name, lba, blksize);
 503 #endif
 504
 505         memset(&cgc, 0, sizeof(struct packet_command));
 506         cgc.cmd[0] = GPCMD_READ_10;
 507         cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
 508         cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
 509         cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
 510         cgc.cmd[5] = (unsigned char) lba & 0xff;
 511         cgc.cmd[8] = 1;
 512         cgc.buffer = dest;
 513         cgc.buflen = blksize;
 514         cgc.data_direction = DMA_FROM_DEVICE;
 515         cgc.timeout = IOCTL_TIMEOUT;
 516         rc = sr_do_ioctl(cd, &cgc);
 517
 518         return rc;
 519 }
 520
 521 /*
 522  * read a sector in raw mode to check the sector format
 523  * ret: 1 == mode2 (XA), 0 == mode1, <0 == error
 524  */
 525
 526 int sr_is_xa(Scsi_CD *cd)
 527 {
 528         unsigned char *raw_sector;
 529         int is_xa;
 530
 531         if (!xa_test)
 532                 return 0;
 533
 534         raw_sector = (unsigned char *) kmalloc(2048, GFP_KERNEL | SR_GFP_DMA(cd));
 535         if (!raw_sector)
 536                 return -ENOMEM;
 537         if (0 == sr_read_sector(cd, cd->ms_offset + 16,
 538                                 CD_FRAMESIZE_RAW1, raw_sector)) {
 539                 is_xa = (raw_sector[3] == 0x02) ? 1 : 0;
 540         } else {
 541                 /* read a raw sector failed for some reason. */
 542                 is_xa = -1;
 543         }
 544         kfree(raw_sector);
 545 #ifdef DEBUG
 546         printk("%s: sr_is_xa: %d\n", cd->cdi.name, is_xa);
 547 #endif
 548         return is_xa;
 549 }
 550
 551 int sr_dev_ioctl(struct cdrom_device_info *cdi,
 552                  unsigned int cmd, unsigned long arg)
 553 {
 554         Scsi_CD *cd = cdi->handle;
 555         int ret;
 556
 557         ret = scsi_nonblockable_ioctl(cd->device, cmd,
 558                                       (void __user *)arg, NULL);
 559         /*
 560          * ENODEV means that we didn't recognise the ioctl, or that we
 561          * cannot execute it in the current device state.  In either
 562          * case fall through to scsi_ioctl, which will return ENDOEV again
 563          * if it doesn't recognise the ioctl
 564          */
 565         if (ret != -ENODEV)
 566                 return ret;
 567         return scsi_ioctl(cd->device, cmd, (void __user *)arg);
 568 }