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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * sr.c Copyright (C) 1992 David Giller4 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale5 *6 * adapted from:7 * sd.c Copyright (C) 1992 Drew Eckhardt8 * Linux scsi disk driver by9 * Drew Eckhardt <drew@colorado.edu>10 *11 * Modified by Eric Youngdale ericy@andante.org to12 * add scatter-gather, multiple outstanding request, and other13 * enhancements.14 *15 * Modified by Eric Youngdale eric@andante.org to support loadable16 * low-level scsi drivers.17 *18 * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to19 * provide auto-eject.20 *21 * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the22 * generic cdrom interface23 *24 * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet()25 * interface, capabilities probe additions, ioctl cleanups, etc.26 *27 * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs28 *29 * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM30 * transparently and lose the GHOST hack31 *32 * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br>33 * check resource allocation in sr_init and some cleanups34 */35 36#include <linux/module.h>37#include <linux/fs.h>38#include <linux/kernel.h>39#include <linux/mm.h>40#include <linux/bio.h>41#include <linux/compat.h>42#include <linux/string.h>43#include <linux/errno.h>44#include <linux/cdrom.h>45#include <linux/interrupt.h>46#include <linux/init.h>47#include <linux/major.h>48#include <linux/blkdev.h>49#include <linux/blk-pm.h>50#include <linux/mutex.h>51#include <linux/slab.h>52#include <linux/pm_runtime.h>53#include <linux/uaccess.h>54 55#include <linux/unaligned.h>56 57#include <scsi/scsi.h>58#include <scsi/scsi_dbg.h>59#include <scsi/scsi_device.h>60#include <scsi/scsi_driver.h>61#include <scsi/scsi_cmnd.h>62#include <scsi/scsi_eh.h>63#include <scsi/scsi_host.h>64#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */65 66#include "scsi_logging.h"67#include "sr.h"68 69 70MODULE_DESCRIPTION("SCSI cdrom (sr) driver");71MODULE_LICENSE("GPL");72MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);73MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);74MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);75 76#define SR_DISKS 25677 78#define SR_CAPABILITIES \79 (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \80 CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \81 CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \82 CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \83 CDC_MRW|CDC_MRW_W|CDC_RAM)84 85static int sr_probe(struct device *);86static int sr_remove(struct device *);87static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);88static int sr_done(struct scsi_cmnd *);89static int sr_runtime_suspend(struct device *dev);90 91static const struct dev_pm_ops sr_pm_ops = {92 .runtime_suspend = sr_runtime_suspend,93};94 95static struct scsi_driver sr_template = {96 .gendrv = {97 .name = "sr",98 .probe = sr_probe,99 .remove = sr_remove,100 .pm = &sr_pm_ops,101 },102 .init_command = sr_init_command,103 .done = sr_done,104};105 106static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG];107static DEFINE_SPINLOCK(sr_index_lock);108 109static struct lock_class_key sr_bio_compl_lkclass;110 111static int sr_open(struct cdrom_device_info *, int);112static void sr_release(struct cdrom_device_info *);113 114static int get_sectorsize(struct scsi_cd *);115static int get_capabilities(struct scsi_cd *);116 117static unsigned int sr_check_events(struct cdrom_device_info *cdi,118 unsigned int clearing, int slot);119static int sr_packet(struct cdrom_device_info *, struct packet_command *);120static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,121 u32 lba, u32 nr, u8 *last_sense);122 123static const struct cdrom_device_ops sr_dops = {124 .open = sr_open,125 .release = sr_release,126 .drive_status = sr_drive_status,127 .check_events = sr_check_events,128 .tray_move = sr_tray_move,129 .lock_door = sr_lock_door,130 .select_speed = sr_select_speed,131 .get_last_session = sr_get_last_session,132 .get_mcn = sr_get_mcn,133 .reset = sr_reset,134 .audio_ioctl = sr_audio_ioctl,135 .generic_packet = sr_packet,136 .read_cdda_bpc = sr_read_cdda_bpc,137 .capability = SR_CAPABILITIES,138};139 140static inline struct scsi_cd *scsi_cd(struct gendisk *disk)141{142 return disk->private_data;143}144 145static int sr_runtime_suspend(struct device *dev)146{147 struct scsi_cd *cd = dev_get_drvdata(dev);148 149 if (!cd) /* E.g.: runtime suspend following sr_remove() */150 return 0;151 152 if (cd->media_present)153 return -EBUSY;154 else155 return 0;156}157 158static unsigned int sr_get_events(struct scsi_device *sdev)159{160 u8 buf[8];161 u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION,162 1, /* polled */163 0, 0, /* reserved */164 1 << 4, /* notification class: media */165 0, 0, /* reserved */166 0, sizeof(buf), /* allocation length */167 0, /* control */168 };169 struct event_header *eh = (void *)buf;170 struct media_event_desc *med = (void *)(buf + 4);171 struct scsi_sense_hdr sshdr;172 const struct scsi_exec_args exec_args = {173 .sshdr = &sshdr,174 };175 int result;176 177 result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buf, sizeof(buf),178 SR_TIMEOUT, MAX_RETRIES, &exec_args);179 if (result > 0 && scsi_sense_valid(&sshdr) &&180 sshdr.sense_key == UNIT_ATTENTION)181 return DISK_EVENT_MEDIA_CHANGE;182 183 if (result || be16_to_cpu(eh->data_len) < sizeof(*med))184 return 0;185 186 if (eh->nea || eh->notification_class != 0x4)187 return 0;188 189 if (med->media_event_code == 1)190 return DISK_EVENT_EJECT_REQUEST;191 else if (med->media_event_code == 2)192 return DISK_EVENT_MEDIA_CHANGE;193 else if (med->media_event_code == 3)194 return DISK_EVENT_MEDIA_CHANGE;195 return 0;196}197 198/*199 * This function checks to see if the media has been changed or eject200 * button has been pressed. It is possible that we have already201 * sensed a change, or the drive may have sensed one and not yet202 * reported it. The past events are accumulated in sdev->changed and203 * returned together with the current state.204 */205static unsigned int sr_check_events(struct cdrom_device_info *cdi,206 unsigned int clearing, int slot)207{208 struct scsi_cd *cd = cdi->handle;209 bool last_present;210 struct scsi_sense_hdr sshdr;211 unsigned int events;212 int ret;213 214 /* no changer support */215 if (CDSL_CURRENT != slot)216 return 0;217 218 events = sr_get_events(cd->device);219 cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE;220 221 /*222 * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree223 * for several times in a row. We rely on TUR only for this likely224 * broken device, to prevent generating incorrect media changed225 * events for every open().226 */227 if (cd->ignore_get_event) {228 events &= ~DISK_EVENT_MEDIA_CHANGE;229 goto do_tur;230 }231 232 /*233 * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE234 * is being cleared. Note that there are devices which hang235 * if asked to execute TUR repeatedly.236 */237 if (cd->device->changed) {238 events |= DISK_EVENT_MEDIA_CHANGE;239 cd->device->changed = 0;240 cd->tur_changed = true;241 }242 243 if (!(clearing & DISK_EVENT_MEDIA_CHANGE))244 return events;245do_tur:246 /* let's see whether the media is there with TUR */247 last_present = cd->media_present;248 ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);249 250 /*251 * Media is considered to be present if TUR succeeds or fails with252 * sense data indicating something other than media-not-present253 * (ASC 0x3a).254 */255 cd->media_present = scsi_status_is_good(ret) ||256 (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);257 258 if (last_present != cd->media_present)259 cd->device->changed = 1;260 261 if (cd->device->changed) {262 events |= DISK_EVENT_MEDIA_CHANGE;263 cd->device->changed = 0;264 cd->tur_changed = true;265 }266 267 if (cd->ignore_get_event)268 return events;269 270 /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */271 if (!cd->tur_changed) {272 if (cd->get_event_changed) {273 if (cd->tur_mismatch++ > 8) {274 sr_printk(KERN_WARNING, cd,275 "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n");276 cd->ignore_get_event = true;277 }278 } else {279 cd->tur_mismatch = 0;280 }281 }282 cd->tur_changed = false;283 cd->get_event_changed = false;284 285 return events;286}287 288/*289 * sr_done is the interrupt routine for the device driver.290 *291 * It will be notified on the end of a SCSI read / write, and will take one292 * of several actions based on success or failure.293 */294static int sr_done(struct scsi_cmnd *SCpnt)295{296 int result = SCpnt->result;297 int this_count = scsi_bufflen(SCpnt);298 int good_bytes = (result == 0 ? this_count : 0);299 int block_sectors = 0;300 long error_sector;301 struct request *rq = scsi_cmd_to_rq(SCpnt);302 struct scsi_cd *cd = scsi_cd(rq->q->disk);303 304#ifdef DEBUG305 scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result);306#endif307 308 /*309 * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial310 * success. Since this is a relatively rare error condition, no311 * care is taken to avoid unnecessary additional work such as312 * memcpy's that could be avoided.313 */314 if (scsi_status_is_check_condition(result) &&315 (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */316 switch (SCpnt->sense_buffer[2]) {317 case MEDIUM_ERROR:318 case VOLUME_OVERFLOW:319 case ILLEGAL_REQUEST:320 if (!(SCpnt->sense_buffer[0] & 0x90))321 break;322 error_sector =323 get_unaligned_be32(&SCpnt->sense_buffer[3]);324 if (rq->bio != NULL)325 block_sectors = bio_sectors(rq->bio);326 if (block_sectors < 4)327 block_sectors = 4;328 if (cd->device->sector_size == 2048)329 error_sector <<= 2;330 error_sector &= ~(block_sectors - 1);331 good_bytes = (error_sector - blk_rq_pos(rq)) << 9;332 if (good_bytes < 0 || good_bytes >= this_count)333 good_bytes = 0;334 /*335 * The SCSI specification allows for the value336 * returned by READ CAPACITY to be up to 75 2K337 * sectors past the last readable block.338 * Therefore, if we hit a medium error within the339 * last 75 2K sectors, we decrease the saved size340 * value.341 */342 if (error_sector < get_capacity(cd->disk) &&343 cd->capacity - error_sector < 4 * 75)344 set_capacity(cd->disk, error_sector);345 break;346 347 case RECOVERED_ERROR:348 good_bytes = this_count;349 break;350 351 default:352 break;353 }354 }355 356 return good_bytes;357}358 359static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)360{361 int block = 0, this_count, s_size;362 struct scsi_cd *cd;363 struct request *rq = scsi_cmd_to_rq(SCpnt);364 blk_status_t ret;365 366 ret = scsi_alloc_sgtables(SCpnt);367 if (ret != BLK_STS_OK)368 return ret;369 cd = scsi_cd(rq->q->disk);370 371 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,372 "Doing sr request, block = %d\n", block));373 374 if (!cd->device || !scsi_device_online(cd->device)) {375 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,376 "Finishing %u sectors\n", blk_rq_sectors(rq)));377 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,378 "Retry with 0x%p\n", SCpnt));379 goto out;380 }381 382 if (cd->device->changed) {383 /*384 * quietly refuse to do anything to a changed disc until the385 * changed bit has been reset386 */387 goto out;388 }389 390 s_size = cd->device->sector_size;391 if (s_size != 512 && s_size != 1024 && s_size != 2048) {392 scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size);393 goto out;394 }395 396 switch (req_op(rq)) {397 case REQ_OP_WRITE:398 if (!cd->writeable)399 goto out;400 SCpnt->cmnd[0] = WRITE_10;401 cd->cdi.media_written = 1;402 break;403 case REQ_OP_READ:404 SCpnt->cmnd[0] = READ_10;405 break;406 default:407 blk_dump_rq_flags(rq, "Unknown sr command");408 goto out;409 }410 411 {412 struct scatterlist *sg;413 int i, size = 0, sg_count = scsi_sg_count(SCpnt);414 415 scsi_for_each_sg(SCpnt, sg, sg_count, i)416 size += sg->length;417 418 if (size != scsi_bufflen(SCpnt)) {419 scmd_printk(KERN_ERR, SCpnt,420 "mismatch count %d, bytes %d\n",421 size, scsi_bufflen(SCpnt));422 if (scsi_bufflen(SCpnt) > size)423 SCpnt->sdb.length = size;424 }425 }426 427 /*428 * request doesn't start on hw block boundary, add scatter pads429 */430 if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) ||431 (scsi_bufflen(SCpnt) % s_size)) {432 scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");433 goto out;434 }435 436 this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);437 438 439 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,440 "%s %d/%u 512 byte blocks.\n",441 (rq_data_dir(rq) == WRITE) ?442 "writing" : "reading",443 this_count, blk_rq_sectors(rq)));444 445 SCpnt->cmnd[1] = 0;446 block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9);447 448 if (this_count > 0xffff) {449 this_count = 0xffff;450 SCpnt->sdb.length = this_count * s_size;451 }452 453 put_unaligned_be32(block, &SCpnt->cmnd[2]);454 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;455 put_unaligned_be16(this_count, &SCpnt->cmnd[7]);456 457 /*458 * We shouldn't disconnect in the middle of a sector, so with a dumb459 * host adapter, it's safe to assume that we can at least transfer460 * this many bytes between each connect / disconnect.461 */462 SCpnt->transfersize = cd->device->sector_size;463 SCpnt->underflow = this_count << 9;464 SCpnt->allowed = MAX_RETRIES;465 SCpnt->cmd_len = 10;466 467 /*468 * This indicates that the command is ready from our end to be queued.469 */470 return BLK_STS_OK;471 out:472 scsi_free_sgtables(SCpnt);473 return BLK_STS_IOERR;474}475 476static int sr_revalidate_disk(struct scsi_cd *cd)477{478 struct scsi_sense_hdr sshdr;479 480 /* if the unit is not ready, nothing more to do */481 if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))482 return 0;483 sr_cd_check(&cd->cdi);484 return get_sectorsize(cd);485}486 487static int sr_block_open(struct gendisk *disk, blk_mode_t mode)488{489 struct scsi_cd *cd = scsi_cd(disk);490 struct scsi_device *sdev = cd->device;491 int ret;492 493 if (scsi_device_get(cd->device))494 return -ENXIO;495 496 scsi_autopm_get_device(sdev);497 if (disk_check_media_change(disk)) {498 ret = sr_revalidate_disk(cd);499 if (ret)500 goto out;501 }502 503 mutex_lock(&cd->lock);504 ret = cdrom_open(&cd->cdi, mode);505 mutex_unlock(&cd->lock);506out:507 scsi_autopm_put_device(sdev);508 if (ret)509 scsi_device_put(cd->device);510 return ret;511}512 513static void sr_block_release(struct gendisk *disk)514{515 struct scsi_cd *cd = scsi_cd(disk);516 517 mutex_lock(&cd->lock);518 cdrom_release(&cd->cdi);519 mutex_unlock(&cd->lock);520 521 scsi_device_put(cd->device);522}523 524static int sr_block_ioctl(struct block_device *bdev, blk_mode_t mode,525 unsigned cmd, unsigned long arg)526{527 struct scsi_cd *cd = scsi_cd(bdev->bd_disk);528 struct scsi_device *sdev = cd->device;529 void __user *argp = (void __user *)arg;530 int ret;531 532 if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))533 return -ENOIOCTLCMD;534 535 mutex_lock(&cd->lock);536 537 ret = scsi_ioctl_block_when_processing_errors(sdev, cmd,538 (mode & BLK_OPEN_NDELAY));539 if (ret)540 goto out;541 542 scsi_autopm_get_device(sdev);543 544 if (cmd != CDROMCLOSETRAY && cmd != CDROMEJECT) {545 ret = cdrom_ioctl(&cd->cdi, bdev, cmd, arg);546 if (ret != -ENOSYS)547 goto put;548 }549 ret = scsi_ioctl(sdev, mode & BLK_OPEN_WRITE, cmd, argp);550 551put:552 scsi_autopm_put_device(sdev);553out:554 mutex_unlock(&cd->lock);555 return ret;556}557 558static unsigned int sr_block_check_events(struct gendisk *disk,559 unsigned int clearing)560{561 struct scsi_cd *cd = disk->private_data;562 563 if (atomic_read(&cd->device->disk_events_disable_depth))564 return 0;565 return cdrom_check_events(&cd->cdi, clearing);566}567 568static void sr_free_disk(struct gendisk *disk)569{570 struct scsi_cd *cd = disk->private_data;571 572 spin_lock(&sr_index_lock);573 clear_bit(MINOR(disk_devt(disk)), sr_index_bits);574 spin_unlock(&sr_index_lock);575 576 unregister_cdrom(&cd->cdi);577 mutex_destroy(&cd->lock);578 kfree(cd);579}580 581static const struct block_device_operations sr_bdops =582{583 .owner = THIS_MODULE,584 .open = sr_block_open,585 .release = sr_block_release,586 .ioctl = sr_block_ioctl,587 .compat_ioctl = blkdev_compat_ptr_ioctl,588 .check_events = sr_block_check_events,589 .free_disk = sr_free_disk,590};591 592static int sr_open(struct cdrom_device_info *cdi, int purpose)593{594 struct scsi_cd *cd = cdi->handle;595 struct scsi_device *sdev = cd->device;596 597 /*598 * If the device is in error recovery, wait until it is done.599 * If the device is offline, then disallow any access to it.600 */601 if (!scsi_block_when_processing_errors(sdev))602 return -ENXIO;603 604 return 0;605}606 607static void sr_release(struct cdrom_device_info *cdi)608{609}610 611static int sr_probe(struct device *dev)612{613 struct scsi_device *sdev = to_scsi_device(dev);614 struct gendisk *disk;615 struct scsi_cd *cd;616 int minor, error;617 618 scsi_autopm_get_device(sdev);619 error = -ENODEV;620 if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM)621 goto fail;622 623 error = -ENOMEM;624 cd = kzalloc(sizeof(*cd), GFP_KERNEL);625 if (!cd)626 goto fail;627 628 disk = blk_mq_alloc_disk_for_queue(sdev->request_queue,629 &sr_bio_compl_lkclass);630 if (!disk)631 goto fail_free;632 mutex_init(&cd->lock);633 634 spin_lock(&sr_index_lock);635 minor = find_first_zero_bit(sr_index_bits, SR_DISKS);636 if (minor == SR_DISKS) {637 spin_unlock(&sr_index_lock);638 error = -EBUSY;639 goto fail_put;640 }641 __set_bit(minor, sr_index_bits);642 spin_unlock(&sr_index_lock);643 644 disk->major = SCSI_CDROM_MAJOR;645 disk->first_minor = minor;646 disk->minors = 1;647 sprintf(disk->disk_name, "sr%d", minor);648 disk->fops = &sr_bdops;649 disk->flags |= GENHD_FL_REMOVABLE | GENHD_FL_NO_PART;650 disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;651 disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT |652 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE;653 654 blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);655 656 cd->device = sdev;657 cd->disk = disk;658 cd->capacity = 0x1fffff;659 cd->device->changed = 1; /* force recheck CD type */660 cd->media_present = 1;661 cd->use = 1;662 cd->readcd_known = 0;663 cd->readcd_cdda = 0;664 665 cd->cdi.ops = &sr_dops;666 cd->cdi.handle = cd;667 cd->cdi.mask = 0;668 cd->cdi.capacity = 1;669 sprintf(cd->cdi.name, "sr%d", minor);670 671 sdev->sector_size = 2048; /* A guess, just in case */672 673 error = -ENOMEM;674 if (get_capabilities(cd))675 goto fail_minor;676 sr_vendor_init(cd);677 678 set_capacity(disk, cd->capacity);679 disk->private_data = cd;680 681 if (register_cdrom(disk, &cd->cdi))682 goto fail_minor;683 684 /*685 * Initialize block layer runtime PM stuffs before the686 * periodic event checking request gets started in add_disk.687 */688 blk_pm_runtime_init(sdev->request_queue, dev);689 690 dev_set_drvdata(dev, cd);691 error = sr_revalidate_disk(cd);692 if (error)693 goto unregister_cdrom;694 695 error = device_add_disk(&sdev->sdev_gendev, disk, NULL);696 if (error)697 goto unregister_cdrom;698 699 sdev_printk(KERN_DEBUG, sdev,700 "Attached scsi CD-ROM %s\n", cd->cdi.name);701 scsi_autopm_put_device(cd->device);702 703 return 0;704 705unregister_cdrom:706 unregister_cdrom(&cd->cdi);707fail_minor:708 spin_lock(&sr_index_lock);709 clear_bit(minor, sr_index_bits);710 spin_unlock(&sr_index_lock);711fail_put:712 put_disk(disk);713 mutex_destroy(&cd->lock);714fail_free:715 kfree(cd);716fail:717 scsi_autopm_put_device(sdev);718 return error;719}720 721 722static int get_sectorsize(struct scsi_cd *cd)723{724 struct request_queue *q = cd->device->request_queue;725 static const u8 cmd[10] = { READ_CAPACITY };726 unsigned char buffer[8] = { };727 struct queue_limits lim;728 int err;729 int sector_size;730 struct scsi_failure failure_defs[] = {731 {732 .result = SCMD_FAILURE_RESULT_ANY,733 .allowed = 3,734 },735 {}736 };737 struct scsi_failures failures = {738 .failure_definitions = failure_defs,739 };740 const struct scsi_exec_args exec_args = {741 .failures = &failures,742 };743 744 /* Do the command and wait.. */745 err = scsi_execute_cmd(cd->device, cmd, REQ_OP_DRV_IN, buffer,746 sizeof(buffer), SR_TIMEOUT, MAX_RETRIES,747 &exec_args);748 if (err) {749 cd->capacity = 0x1fffff;750 sector_size = 2048; /* A guess, just in case */751 } else {752 long last_written;753 754 cd->capacity = 1 + get_unaligned_be32(&buffer[0]);755 /*756 * READ_CAPACITY doesn't return the correct size on757 * certain UDF media. If last_written is larger, use758 * it instead.759 *760 * http://bugzilla.kernel.org/show_bug.cgi?id=9668761 */762 if (!cdrom_get_last_written(&cd->cdi, &last_written))763 cd->capacity = max_t(long, cd->capacity, last_written);764 765 sector_size = get_unaligned_be32(&buffer[4]);766 switch (sector_size) {767 /*768 * HP 4020i CD-Recorder reports 2340 byte sectors769 * Philips CD-Writers report 2352 byte sectors770 *771 * Use 2k sectors for them..772 */773 case 0:774 case 2340:775 case 2352:776 sector_size = 2048;777 fallthrough;778 case 2048:779 cd->capacity *= 4;780 fallthrough;781 case 512:782 break;783 default:784 sr_printk(KERN_INFO, cd,785 "unsupported sector size %d.", sector_size);786 cd->capacity = 0;787 }788 789 cd->device->sector_size = sector_size;790 791 /*792 * Add this so that we have the ability to correctly gauge793 * what the device is capable of.794 */795 set_capacity(cd->disk, cd->capacity);796 }797 798 lim = queue_limits_start_update(q);799 lim.logical_block_size = sector_size;800 blk_mq_freeze_queue(q);801 err = queue_limits_commit_update(q, &lim);802 blk_mq_unfreeze_queue(q);803 return err;804}805 806static int get_capabilities(struct scsi_cd *cd)807{808 unsigned char *buffer;809 struct scsi_mode_data data;810 struct scsi_sense_hdr sshdr;811 unsigned int ms_len = 128;812 int rc, n;813 814 static const char *loadmech[] =815 {816 "caddy",817 "tray",818 "pop-up",819 "",820 "changer",821 "cartridge changer",822 "",823 ""824 };825 826 827 /* allocate transfer buffer */828 buffer = kmalloc(512, GFP_KERNEL);829 if (!buffer) {830 sr_printk(KERN_ERR, cd, "out of memory.\n");831 return -ENOMEM;832 }833 834 /* eat unit attentions */835 scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr);836 837 /* ask for mode page 0x2a */838 rc = scsi_mode_sense(cd->device, 0, 0x2a, 0, buffer, ms_len,839 SR_TIMEOUT, 3, &data, NULL);840 841 if (rc < 0 || data.length > ms_len ||842 data.header_length + data.block_descriptor_length > data.length) {843 /* failed, drive doesn't have capabilities mode page */844 cd->cdi.speed = 1;845 cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R |846 CDC_DVD | CDC_DVD_RAM |847 CDC_SELECT_DISC | CDC_SELECT_SPEED |848 CDC_MRW | CDC_MRW_W | CDC_RAM);849 kfree(buffer);850 sr_printk(KERN_INFO, cd, "scsi-1 drive");851 return 0;852 }853 854 n = data.header_length + data.block_descriptor_length;855 cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176;856 cd->readcd_known = 1;857 cd->readcd_cdda = buffer[n + 5] & 0x01;858 /* print some capability bits */859 sr_printk(KERN_INFO, cd,860 "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n",861 get_unaligned_be16(&buffer[n + 14]) / 176,862 cd->cdi.speed,863 buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */864 buffer[n + 3] & 0x20 ? "dvd-ram " : "",865 buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */866 buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */867 buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */868 loadmech[buffer[n + 6] >> 5]);869 if ((buffer[n + 6] >> 5) == 0)870 /* caddy drives can't close tray... */871 cd->cdi.mask |= CDC_CLOSE_TRAY;872 if ((buffer[n + 2] & 0x8) == 0)873 /* not a DVD drive */874 cd->cdi.mask |= CDC_DVD;875 if ((buffer[n + 3] & 0x20) == 0)876 /* can't write DVD-RAM media */877 cd->cdi.mask |= CDC_DVD_RAM;878 if ((buffer[n + 3] & 0x10) == 0)879 /* can't write DVD-R media */880 cd->cdi.mask |= CDC_DVD_R;881 if ((buffer[n + 3] & 0x2) == 0)882 /* can't write CD-RW media */883 cd->cdi.mask |= CDC_CD_RW;884 if ((buffer[n + 3] & 0x1) == 0)885 /* can't write CD-R media */886 cd->cdi.mask |= CDC_CD_R;887 if ((buffer[n + 6] & 0x8) == 0)888 /* can't eject */889 cd->cdi.mask |= CDC_OPEN_TRAY;890 891 if ((buffer[n + 6] >> 5) == mechtype_individual_changer ||892 (buffer[n + 6] >> 5) == mechtype_cartridge_changer)893 cd->cdi.capacity =894 cdrom_number_of_slots(&cd->cdi);895 if (cd->cdi.capacity <= 1)896 /* not a changer */897 cd->cdi.mask |= CDC_SELECT_DISC;898 /*else I don't think it can close its tray899 cd->cdi.mask |= CDC_CLOSE_TRAY; */900 901 /*902 * if DVD-RAM, MRW-W or CD-RW, we are randomly writable903 */904 if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) !=905 (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) {906 cd->writeable = 1;907 }908 909 kfree(buffer);910 return 0;911}912 913/*914 * sr_packet() is the entry point for the generic commands generated915 * by the Uniform CD-ROM layer.916 */917static int sr_packet(struct cdrom_device_info *cdi,918 struct packet_command *cgc)919{920 struct scsi_cd *cd = cdi->handle;921 struct scsi_device *sdev = cd->device;922 923 if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)924 return -EDRIVE_CANT_DO_THIS;925 926 if (cgc->timeout <= 0)927 cgc->timeout = IOCTL_TIMEOUT;928 929 sr_do_ioctl(cd, cgc);930 931 return cgc->stat;932}933 934static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf,935 u32 lba, u32 nr, u8 *last_sense)936{937 struct gendisk *disk = cdi->disk;938 u32 len = nr * CD_FRAMESIZE_RAW;939 struct scsi_cmnd *scmd;940 struct request *rq;941 struct bio *bio;942 int ret;943 944 rq = scsi_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);945 if (IS_ERR(rq))946 return PTR_ERR(rq);947 scmd = blk_mq_rq_to_pdu(rq);948 949 ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL);950 if (ret)951 goto out_put_request;952 953 scmd->cmnd[0] = GPCMD_READ_CD;954 scmd->cmnd[1] = 1 << 2;955 scmd->cmnd[2] = (lba >> 24) & 0xff;956 scmd->cmnd[3] = (lba >> 16) & 0xff;957 scmd->cmnd[4] = (lba >> 8) & 0xff;958 scmd->cmnd[5] = lba & 0xff;959 scmd->cmnd[6] = (nr >> 16) & 0xff;960 scmd->cmnd[7] = (nr >> 8) & 0xff;961 scmd->cmnd[8] = nr & 0xff;962 scmd->cmnd[9] = 0xf8;963 scmd->cmd_len = 12;964 rq->timeout = 60 * HZ;965 bio = rq->bio;966 967 blk_execute_rq(rq, false);968 if (scmd->result) {969 struct scsi_sense_hdr sshdr;970 971 scsi_normalize_sense(scmd->sense_buffer, scmd->sense_len,972 &sshdr);973 *last_sense = sshdr.sense_key;974 ret = -EIO;975 }976 977 if (blk_rq_unmap_user(bio))978 ret = -EFAULT;979out_put_request:980 blk_mq_free_request(rq);981 return ret;982}983 984static int sr_remove(struct device *dev)985{986 struct scsi_cd *cd = dev_get_drvdata(dev);987 988 scsi_autopm_get_device(cd->device);989 990 del_gendisk(cd->disk);991 put_disk(cd->disk);992 993 return 0;994}995 996static int __init init_sr(void)997{998 int rc;999 1000 rc = register_blkdev(SCSI_CDROM_MAJOR, "sr");1001 if (rc)1002 return rc;1003 rc = scsi_register_driver(&sr_template.gendrv);1004 if (rc)1005 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");1006 1007 return rc;1008}1009 1010static void __exit exit_sr(void)1011{1012 scsi_unregister_driver(&sr_template.gendrv);1013 unregister_blkdev(SCSI_CDROM_MAJOR, "sr");1014}1015 1016module_init(init_sr);1017module_exit(exit_sr);1018MODULE_LICENSE("GPL");1019