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1077 lines
26 KiB
1077 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* sr.c Copyright (C) 1992 David Giller |
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale |
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* |
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* adapted from: |
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* sd.c Copyright (C) 1992 Drew Eckhardt |
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* Linux scsi disk driver by |
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* Drew Eckhardt <[email protected]> |
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* |
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* Modified by Eric Youngdale [email protected] to |
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* add scatter-gather, multiple outstanding request, and other |
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* enhancements. |
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* |
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* Modified by Eric Youngdale [email protected] to support loadable |
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* low-level scsi drivers. |
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* |
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* Modified by Thomas Quinot [email protected] to |
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* provide auto-eject. |
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* |
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* Modified by Gerd Knorr <[email protected]> to support the |
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* generic cdrom interface |
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* |
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* Modified by Jens Axboe <[email protected]> - Uniform sr_packet() |
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* interface, capabilities probe additions, ioctl cleanups, etc. |
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* |
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* Modified by Richard Gooch <[email protected]> to support devfs |
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* |
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* Modified by Jens Axboe <[email protected]> - support DVD-RAM |
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* transparently and lose the GHOST hack |
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* |
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* Modified by Arnaldo Carvalho de Melo <[email protected]> |
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* check resource allocation in sr_init and some cleanups |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/bio.h> |
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#include <linux/compat.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/cdrom.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/blkdev.h> |
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#include <linux/blk-pm.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/uaccess.h> |
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|
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#include <asm/unaligned.h> |
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|
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#include <scsi/scsi.h> |
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#include <scsi/scsi_dbg.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_driver.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ |
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|
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#include "scsi_logging.h" |
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#include "sr.h" |
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|
|
|
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MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); |
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MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
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MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); |
|
|
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#define SR_DISKS 256 |
|
|
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#define SR_CAPABILITIES \ |
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(CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ |
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CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ |
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CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
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CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
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CDC_MRW|CDC_MRW_W|CDC_RAM) |
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|
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static int sr_probe(struct device *); |
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static int sr_remove(struct device *); |
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static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); |
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static int sr_done(struct scsi_cmnd *); |
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static int sr_runtime_suspend(struct device *dev); |
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|
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static const struct dev_pm_ops sr_pm_ops = { |
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.runtime_suspend = sr_runtime_suspend, |
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}; |
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|
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static struct scsi_driver sr_template = { |
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.gendrv = { |
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.name = "sr", |
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.owner = THIS_MODULE, |
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.probe = sr_probe, |
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.remove = sr_remove, |
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.pm = &sr_pm_ops, |
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}, |
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.init_command = sr_init_command, |
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.done = sr_done, |
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}; |
|
|
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static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; |
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static DEFINE_SPINLOCK(sr_index_lock); |
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|
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static struct lock_class_key sr_bio_compl_lkclass; |
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|
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/* This semaphore is used to mediate the 0->1 reference get in the |
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* face of object destruction (i.e. we can't allow a get on an |
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* object after last put) */ |
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static DEFINE_MUTEX(sr_ref_mutex); |
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|
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static int sr_open(struct cdrom_device_info *, int); |
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static void sr_release(struct cdrom_device_info *); |
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|
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static void get_sectorsize(struct scsi_cd *); |
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static void get_capabilities(struct scsi_cd *); |
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|
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static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
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unsigned int clearing, int slot); |
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static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
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static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, |
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u32 lba, u32 nr, u8 *last_sense); |
|
|
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static const struct cdrom_device_ops sr_dops = { |
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.open = sr_open, |
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.release = sr_release, |
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.drive_status = sr_drive_status, |
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.check_events = sr_check_events, |
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.tray_move = sr_tray_move, |
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.lock_door = sr_lock_door, |
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.select_speed = sr_select_speed, |
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.get_last_session = sr_get_last_session, |
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.get_mcn = sr_get_mcn, |
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.reset = sr_reset, |
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.audio_ioctl = sr_audio_ioctl, |
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.generic_packet = sr_packet, |
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.read_cdda_bpc = sr_read_cdda_bpc, |
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.capability = SR_CAPABILITIES, |
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}; |
|
|
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static void sr_kref_release(struct kref *kref); |
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|
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static inline struct scsi_cd *scsi_cd(struct gendisk *disk) |
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{ |
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return container_of(disk->private_data, struct scsi_cd, driver); |
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} |
|
|
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static int sr_runtime_suspend(struct device *dev) |
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{ |
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struct scsi_cd *cd = dev_get_drvdata(dev); |
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|
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if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
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return 0; |
|
|
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if (cd->media_present) |
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return -EBUSY; |
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else |
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return 0; |
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} |
|
|
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/* |
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* The get and put routines for the struct scsi_cd. Note this entity |
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* has a scsi_device pointer and owns a reference to this. |
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*/ |
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static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) |
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{ |
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struct scsi_cd *cd = NULL; |
|
|
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mutex_lock(&sr_ref_mutex); |
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if (disk->private_data == NULL) |
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goto out; |
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cd = scsi_cd(disk); |
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kref_get(&cd->kref); |
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if (scsi_device_get(cd->device)) { |
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kref_put(&cd->kref, sr_kref_release); |
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cd = NULL; |
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} |
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out: |
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mutex_unlock(&sr_ref_mutex); |
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return cd; |
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} |
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|
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static void scsi_cd_put(struct scsi_cd *cd) |
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{ |
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struct scsi_device *sdev = cd->device; |
|
|
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mutex_lock(&sr_ref_mutex); |
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kref_put(&cd->kref, sr_kref_release); |
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scsi_device_put(sdev); |
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mutex_unlock(&sr_ref_mutex); |
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} |
|
|
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static unsigned int sr_get_events(struct scsi_device *sdev) |
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{ |
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u8 buf[8]; |
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u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, |
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1, /* polled */ |
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0, 0, /* reserved */ |
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1 << 4, /* notification class: media */ |
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0, 0, /* reserved */ |
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0, sizeof(buf), /* allocation length */ |
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0, /* control */ |
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}; |
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struct event_header *eh = (void *)buf; |
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struct media_event_desc *med = (void *)(buf + 4); |
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struct scsi_sense_hdr sshdr; |
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int result; |
|
|
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result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), |
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&sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); |
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if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) |
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return DISK_EVENT_MEDIA_CHANGE; |
|
|
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if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) |
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return 0; |
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|
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if (eh->nea || eh->notification_class != 0x4) |
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return 0; |
|
|
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if (med->media_event_code == 1) |
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return DISK_EVENT_EJECT_REQUEST; |
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else if (med->media_event_code == 2) |
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return DISK_EVENT_MEDIA_CHANGE; |
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else if (med->media_event_code == 3) |
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return DISK_EVENT_MEDIA_CHANGE; |
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return 0; |
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} |
|
|
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/* |
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* This function checks to see if the media has been changed or eject |
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* button has been pressed. It is possible that we have already |
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* sensed a change, or the drive may have sensed one and not yet |
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* reported it. The past events are accumulated in sdev->changed and |
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* returned together with the current state. |
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*/ |
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static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
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unsigned int clearing, int slot) |
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{ |
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struct scsi_cd *cd = cdi->handle; |
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bool last_present; |
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struct scsi_sense_hdr sshdr; |
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unsigned int events; |
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int ret; |
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|
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/* no changer support */ |
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if (CDSL_CURRENT != slot) |
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return 0; |
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|
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events = sr_get_events(cd->device); |
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cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
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|
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/* |
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* If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree |
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* for several times in a row. We rely on TUR only for this likely |
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* broken device, to prevent generating incorrect media changed |
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* events for every open(). |
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*/ |
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if (cd->ignore_get_event) { |
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events &= ~DISK_EVENT_MEDIA_CHANGE; |
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goto do_tur; |
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} |
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|
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/* |
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* GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE |
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* is being cleared. Note that there are devices which hang |
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* if asked to execute TUR repeatedly. |
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*/ |
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if (cd->device->changed) { |
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events |= DISK_EVENT_MEDIA_CHANGE; |
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cd->device->changed = 0; |
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cd->tur_changed = true; |
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} |
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|
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if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
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return events; |
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do_tur: |
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/* let's see whether the media is there with TUR */ |
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last_present = cd->media_present; |
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ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
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|
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/* |
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* Media is considered to be present if TUR succeeds or fails with |
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* sense data indicating something other than media-not-present |
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* (ASC 0x3a). |
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*/ |
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cd->media_present = scsi_status_is_good(ret) || |
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(scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); |
|
|
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if (last_present != cd->media_present) |
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cd->device->changed = 1; |
|
|
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if (cd->device->changed) { |
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events |= DISK_EVENT_MEDIA_CHANGE; |
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cd->device->changed = 0; |
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cd->tur_changed = true; |
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} |
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|
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if (cd->ignore_get_event) |
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return events; |
|
|
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/* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ |
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if (!cd->tur_changed) { |
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if (cd->get_event_changed) { |
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if (cd->tur_mismatch++ > 8) { |
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sr_printk(KERN_WARNING, cd, |
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"GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); |
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cd->ignore_get_event = true; |
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} |
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} else { |
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cd->tur_mismatch = 0; |
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} |
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} |
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cd->tur_changed = false; |
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cd->get_event_changed = false; |
|
|
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return events; |
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} |
|
|
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/* |
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* sr_done is the interrupt routine for the device driver. |
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* |
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* It will be notified on the end of a SCSI read / write, and will take one |
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* of several actions based on success or failure. |
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*/ |
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static int sr_done(struct scsi_cmnd *SCpnt) |
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{ |
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int result = SCpnt->result; |
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int this_count = scsi_bufflen(SCpnt); |
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int good_bytes = (result == 0 ? this_count : 0); |
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int block_sectors = 0; |
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long error_sector; |
|
struct request *rq = scsi_cmd_to_rq(SCpnt); |
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struct scsi_cd *cd = scsi_cd(rq->rq_disk); |
|
|
|
#ifdef DEBUG |
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scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
|
#endif |
|
|
|
/* |
|
* Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial |
|
* success. Since this is a relatively rare error condition, no |
|
* care is taken to avoid unnecessary additional work such as |
|
* memcpy's that could be avoided. |
|
*/ |
|
if (scsi_status_is_check_condition(result) && |
|
(SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ |
|
switch (SCpnt->sense_buffer[2]) { |
|
case MEDIUM_ERROR: |
|
case VOLUME_OVERFLOW: |
|
case ILLEGAL_REQUEST: |
|
if (!(SCpnt->sense_buffer[0] & 0x90)) |
|
break; |
|
error_sector = |
|
get_unaligned_be32(&SCpnt->sense_buffer[3]); |
|
if (rq->bio != NULL) |
|
block_sectors = bio_sectors(rq->bio); |
|
if (block_sectors < 4) |
|
block_sectors = 4; |
|
if (cd->device->sector_size == 2048) |
|
error_sector <<= 2; |
|
error_sector &= ~(block_sectors - 1); |
|
good_bytes = (error_sector - blk_rq_pos(rq)) << 9; |
|
if (good_bytes < 0 || good_bytes >= this_count) |
|
good_bytes = 0; |
|
/* |
|
* The SCSI specification allows for the value |
|
* returned by READ CAPACITY to be up to 75 2K |
|
* sectors past the last readable block. |
|
* Therefore, if we hit a medium error within the |
|
* last 75 2K sectors, we decrease the saved size |
|
* value. |
|
*/ |
|
if (error_sector < get_capacity(cd->disk) && |
|
cd->capacity - error_sector < 4 * 75) |
|
set_capacity(cd->disk, error_sector); |
|
break; |
|
|
|
case RECOVERED_ERROR: |
|
good_bytes = this_count; |
|
break; |
|
|
|
default: |
|
break; |
|
} |
|
} |
|
|
|
return good_bytes; |
|
} |
|
|
|
static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) |
|
{ |
|
int block = 0, this_count, s_size; |
|
struct scsi_cd *cd; |
|
struct request *rq = scsi_cmd_to_rq(SCpnt); |
|
blk_status_t ret; |
|
|
|
ret = scsi_alloc_sgtables(SCpnt); |
|
if (ret != BLK_STS_OK) |
|
return ret; |
|
cd = scsi_cd(rq->rq_disk); |
|
|
|
SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
|
"Doing sr request, block = %d\n", block)); |
|
|
|
if (!cd->device || !scsi_device_online(cd->device)) { |
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
|
"Finishing %u sectors\n", blk_rq_sectors(rq))); |
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
|
"Retry with 0x%p\n", SCpnt)); |
|
goto out; |
|
} |
|
|
|
if (cd->device->changed) { |
|
/* |
|
* quietly refuse to do anything to a changed disc until the |
|
* changed bit has been reset |
|
*/ |
|
goto out; |
|
} |
|
|
|
s_size = cd->device->sector_size; |
|
if (s_size != 512 && s_size != 1024 && s_size != 2048) { |
|
scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
|
goto out; |
|
} |
|
|
|
switch (req_op(rq)) { |
|
case REQ_OP_WRITE: |
|
if (!cd->writeable) |
|
goto out; |
|
SCpnt->cmnd[0] = WRITE_10; |
|
cd->cdi.media_written = 1; |
|
break; |
|
case REQ_OP_READ: |
|
SCpnt->cmnd[0] = READ_10; |
|
break; |
|
default: |
|
blk_dump_rq_flags(rq, "Unknown sr command"); |
|
goto out; |
|
} |
|
|
|
{ |
|
struct scatterlist *sg; |
|
int i, size = 0, sg_count = scsi_sg_count(SCpnt); |
|
|
|
scsi_for_each_sg(SCpnt, sg, sg_count, i) |
|
size += sg->length; |
|
|
|
if (size != scsi_bufflen(SCpnt)) { |
|
scmd_printk(KERN_ERR, SCpnt, |
|
"mismatch count %d, bytes %d\n", |
|
size, scsi_bufflen(SCpnt)); |
|
if (scsi_bufflen(SCpnt) > size) |
|
SCpnt->sdb.length = size; |
|
} |
|
} |
|
|
|
/* |
|
* request doesn't start on hw block boundary, add scatter pads |
|
*/ |
|
if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
|
(scsi_bufflen(SCpnt) % s_size)) { |
|
scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
|
goto out; |
|
} |
|
|
|
this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
|
|
|
|
|
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
|
"%s %d/%u 512 byte blocks.\n", |
|
(rq_data_dir(rq) == WRITE) ? |
|
"writing" : "reading", |
|
this_count, blk_rq_sectors(rq))); |
|
|
|
SCpnt->cmnd[1] = 0; |
|
block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
|
|
|
if (this_count > 0xffff) { |
|
this_count = 0xffff; |
|
SCpnt->sdb.length = this_count * s_size; |
|
} |
|
|
|
put_unaligned_be32(block, &SCpnt->cmnd[2]); |
|
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
|
put_unaligned_be16(this_count, &SCpnt->cmnd[7]); |
|
|
|
/* |
|
* We shouldn't disconnect in the middle of a sector, so with a dumb |
|
* host adapter, it's safe to assume that we can at least transfer |
|
* this many bytes between each connect / disconnect. |
|
*/ |
|
SCpnt->transfersize = cd->device->sector_size; |
|
SCpnt->underflow = this_count << 9; |
|
SCpnt->allowed = MAX_RETRIES; |
|
SCpnt->cmd_len = 10; |
|
|
|
/* |
|
* This indicates that the command is ready from our end to be queued. |
|
*/ |
|
return BLK_STS_OK; |
|
out: |
|
scsi_free_sgtables(SCpnt); |
|
return BLK_STS_IOERR; |
|
} |
|
|
|
static void sr_revalidate_disk(struct scsi_cd *cd) |
|
{ |
|
struct scsi_sense_hdr sshdr; |
|
|
|
/* if the unit is not ready, nothing more to do */ |
|
if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) |
|
return; |
|
sr_cd_check(&cd->cdi); |
|
get_sectorsize(cd); |
|
} |
|
|
|
static int sr_block_open(struct block_device *bdev, fmode_t mode) |
|
{ |
|
struct scsi_cd *cd; |
|
struct scsi_device *sdev; |
|
int ret = -ENXIO; |
|
|
|
cd = scsi_cd_get(bdev->bd_disk); |
|
if (!cd) |
|
goto out; |
|
|
|
sdev = cd->device; |
|
scsi_autopm_get_device(sdev); |
|
if (bdev_check_media_change(bdev)) |
|
sr_revalidate_disk(cd); |
|
|
|
mutex_lock(&cd->lock); |
|
ret = cdrom_open(&cd->cdi, bdev, mode); |
|
mutex_unlock(&cd->lock); |
|
|
|
scsi_autopm_put_device(sdev); |
|
if (ret) |
|
scsi_cd_put(cd); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
static void sr_block_release(struct gendisk *disk, fmode_t mode) |
|
{ |
|
struct scsi_cd *cd = scsi_cd(disk); |
|
|
|
mutex_lock(&cd->lock); |
|
cdrom_release(&cd->cdi, mode); |
|
mutex_unlock(&cd->lock); |
|
|
|
scsi_cd_put(cd); |
|
} |
|
|
|
static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
|
unsigned long arg) |
|
{ |
|
struct gendisk *disk = bdev->bd_disk; |
|
struct scsi_cd *cd = scsi_cd(disk); |
|
struct scsi_device *sdev = cd->device; |
|
void __user *argp = (void __user *)arg; |
|
int ret; |
|
|
|
if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO)) |
|
return -ENOIOCTLCMD; |
|
|
|
mutex_lock(&cd->lock); |
|
|
|
ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
|
(mode & FMODE_NDELAY) != 0); |
|
if (ret) |
|
goto out; |
|
|
|
scsi_autopm_get_device(sdev); |
|
|
|
if (ret != CDROMCLOSETRAY && ret != CDROMEJECT) { |
|
ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
|
if (ret != -ENOSYS) |
|
goto put; |
|
} |
|
ret = scsi_ioctl(sdev, disk, mode, cmd, argp); |
|
|
|
put: |
|
scsi_autopm_put_device(sdev); |
|
out: |
|
mutex_unlock(&cd->lock); |
|
return ret; |
|
} |
|
|
|
static unsigned int sr_block_check_events(struct gendisk *disk, |
|
unsigned int clearing) |
|
{ |
|
unsigned int ret = 0; |
|
struct scsi_cd *cd; |
|
|
|
cd = scsi_cd_get(disk); |
|
if (!cd) |
|
return 0; |
|
|
|
if (!atomic_read(&cd->device->disk_events_disable_depth)) |
|
ret = cdrom_check_events(&cd->cdi, clearing); |
|
|
|
scsi_cd_put(cd); |
|
return ret; |
|
} |
|
|
|
static const struct block_device_operations sr_bdops = |
|
{ |
|
.owner = THIS_MODULE, |
|
.open = sr_block_open, |
|
.release = sr_block_release, |
|
.ioctl = sr_block_ioctl, |
|
.compat_ioctl = blkdev_compat_ptr_ioctl, |
|
.check_events = sr_block_check_events, |
|
}; |
|
|
|
static int sr_open(struct cdrom_device_info *cdi, int purpose) |
|
{ |
|
struct scsi_cd *cd = cdi->handle; |
|
struct scsi_device *sdev = cd->device; |
|
int retval; |
|
|
|
/* |
|
* If the device is in error recovery, wait until it is done. |
|
* If the device is offline, then disallow any access to it. |
|
*/ |
|
retval = -ENXIO; |
|
if (!scsi_block_when_processing_errors(sdev)) |
|
goto error_out; |
|
|
|
return 0; |
|
|
|
error_out: |
|
return retval; |
|
} |
|
|
|
static void sr_release(struct cdrom_device_info *cdi) |
|
{ |
|
} |
|
|
|
static int sr_probe(struct device *dev) |
|
{ |
|
struct scsi_device *sdev = to_scsi_device(dev); |
|
struct gendisk *disk; |
|
struct scsi_cd *cd; |
|
int minor, error; |
|
|
|
scsi_autopm_get_device(sdev); |
|
error = -ENODEV; |
|
if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) |
|
goto fail; |
|
|
|
error = -ENOMEM; |
|
cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
|
if (!cd) |
|
goto fail; |
|
|
|
kref_init(&cd->kref); |
|
|
|
disk = __alloc_disk_node(sdev->request_queue, NUMA_NO_NODE, |
|
&sr_bio_compl_lkclass); |
|
if (!disk) |
|
goto fail_free; |
|
mutex_init(&cd->lock); |
|
|
|
spin_lock(&sr_index_lock); |
|
minor = find_first_zero_bit(sr_index_bits, SR_DISKS); |
|
if (minor == SR_DISKS) { |
|
spin_unlock(&sr_index_lock); |
|
error = -EBUSY; |
|
goto fail_put; |
|
} |
|
__set_bit(minor, sr_index_bits); |
|
spin_unlock(&sr_index_lock); |
|
|
|
disk->major = SCSI_CDROM_MAJOR; |
|
disk->first_minor = minor; |
|
disk->minors = 1; |
|
sprintf(disk->disk_name, "sr%d", minor); |
|
disk->fops = &sr_bdops; |
|
disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
|
disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
|
disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; |
|
|
|
blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
|
|
|
cd->device = sdev; |
|
cd->disk = disk; |
|
cd->driver = &sr_template; |
|
cd->disk = disk; |
|
cd->capacity = 0x1fffff; |
|
cd->device->changed = 1; /* force recheck CD type */ |
|
cd->media_present = 1; |
|
cd->use = 1; |
|
cd->readcd_known = 0; |
|
cd->readcd_cdda = 0; |
|
|
|
cd->cdi.ops = &sr_dops; |
|
cd->cdi.handle = cd; |
|
cd->cdi.mask = 0; |
|
cd->cdi.capacity = 1; |
|
sprintf(cd->cdi.name, "sr%d", minor); |
|
|
|
sdev->sector_size = 2048; /* A guess, just in case */ |
|
|
|
/* FIXME: need to handle a get_capabilities failure properly ?? */ |
|
get_capabilities(cd); |
|
sr_vendor_init(cd); |
|
|
|
set_capacity(disk, cd->capacity); |
|
disk->private_data = &cd->driver; |
|
|
|
if (register_cdrom(disk, &cd->cdi)) |
|
goto fail_minor; |
|
|
|
/* |
|
* Initialize block layer runtime PM stuffs before the |
|
* periodic event checking request gets started in add_disk. |
|
*/ |
|
blk_pm_runtime_init(sdev->request_queue, dev); |
|
|
|
dev_set_drvdata(dev, cd); |
|
disk->flags |= GENHD_FL_REMOVABLE; |
|
sr_revalidate_disk(cd); |
|
device_add_disk(&sdev->sdev_gendev, disk, NULL); |
|
|
|
sdev_printk(KERN_DEBUG, sdev, |
|
"Attached scsi CD-ROM %s\n", cd->cdi.name); |
|
scsi_autopm_put_device(cd->device); |
|
|
|
return 0; |
|
|
|
fail_minor: |
|
spin_lock(&sr_index_lock); |
|
clear_bit(minor, sr_index_bits); |
|
spin_unlock(&sr_index_lock); |
|
fail_put: |
|
put_disk(disk); |
|
mutex_destroy(&cd->lock); |
|
fail_free: |
|
kfree(cd); |
|
fail: |
|
scsi_autopm_put_device(sdev); |
|
return error; |
|
} |
|
|
|
|
|
static void get_sectorsize(struct scsi_cd *cd) |
|
{ |
|
unsigned char cmd[10]; |
|
unsigned char buffer[8]; |
|
int the_result, retries = 3; |
|
int sector_size; |
|
struct request_queue *queue; |
|
|
|
do { |
|
cmd[0] = READ_CAPACITY; |
|
memset((void *) &cmd[1], 0, 9); |
|
memset(buffer, 0, sizeof(buffer)); |
|
|
|
/* Do the command and wait.. */ |
|
the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
|
buffer, sizeof(buffer), NULL, |
|
SR_TIMEOUT, MAX_RETRIES, NULL); |
|
|
|
retries--; |
|
|
|
} while (the_result && retries); |
|
|
|
|
|
if (the_result) { |
|
cd->capacity = 0x1fffff; |
|
sector_size = 2048; /* A guess, just in case */ |
|
} else { |
|
long last_written; |
|
|
|
cd->capacity = 1 + get_unaligned_be32(&buffer[0]); |
|
/* |
|
* READ_CAPACITY doesn't return the correct size on |
|
* certain UDF media. If last_written is larger, use |
|
* it instead. |
|
* |
|
* http://bugzilla.kernel.org/show_bug.cgi?id=9668 |
|
*/ |
|
if (!cdrom_get_last_written(&cd->cdi, &last_written)) |
|
cd->capacity = max_t(long, cd->capacity, last_written); |
|
|
|
sector_size = get_unaligned_be32(&buffer[4]); |
|
switch (sector_size) { |
|
/* |
|
* HP 4020i CD-Recorder reports 2340 byte sectors |
|
* Philips CD-Writers report 2352 byte sectors |
|
* |
|
* Use 2k sectors for them.. |
|
*/ |
|
case 0: |
|
case 2340: |
|
case 2352: |
|
sector_size = 2048; |
|
fallthrough; |
|
case 2048: |
|
cd->capacity *= 4; |
|
fallthrough; |
|
case 512: |
|
break; |
|
default: |
|
sr_printk(KERN_INFO, cd, |
|
"unsupported sector size %d.", sector_size); |
|
cd->capacity = 0; |
|
} |
|
|
|
cd->device->sector_size = sector_size; |
|
|
|
/* |
|
* Add this so that we have the ability to correctly gauge |
|
* what the device is capable of. |
|
*/ |
|
set_capacity(cd->disk, cd->capacity); |
|
} |
|
|
|
queue = cd->device->request_queue; |
|
blk_queue_logical_block_size(queue, sector_size); |
|
|
|
return; |
|
} |
|
|
|
static void get_capabilities(struct scsi_cd *cd) |
|
{ |
|
unsigned char *buffer; |
|
struct scsi_mode_data data; |
|
struct scsi_sense_hdr sshdr; |
|
unsigned int ms_len = 128; |
|
int rc, n; |
|
|
|
static const char *loadmech[] = |
|
{ |
|
"caddy", |
|
"tray", |
|
"pop-up", |
|
"", |
|
"changer", |
|
"cartridge changer", |
|
"", |
|
"" |
|
}; |
|
|
|
|
|
/* allocate transfer buffer */ |
|
buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); |
|
if (!buffer) { |
|
sr_printk(KERN_ERR, cd, "out of memory.\n"); |
|
return; |
|
} |
|
|
|
/* eat unit attentions */ |
|
scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
|
|
|
/* ask for mode page 0x2a */ |
|
rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
|
SR_TIMEOUT, 3, &data, NULL); |
|
|
|
if (rc < 0 || data.length > ms_len || |
|
data.header_length + data.block_descriptor_length > data.length) { |
|
/* failed, drive doesn't have capabilities mode page */ |
|
cd->cdi.speed = 1; |
|
cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | |
|
CDC_DVD | CDC_DVD_RAM | |
|
CDC_SELECT_DISC | CDC_SELECT_SPEED | |
|
CDC_MRW | CDC_MRW_W | CDC_RAM); |
|
kfree(buffer); |
|
sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
|
return; |
|
} |
|
|
|
n = data.header_length + data.block_descriptor_length; |
|
cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; |
|
cd->readcd_known = 1; |
|
cd->readcd_cdda = buffer[n + 5] & 0x01; |
|
/* print some capability bits */ |
|
sr_printk(KERN_INFO, cd, |
|
"scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", |
|
get_unaligned_be16(&buffer[n + 14]) / 176, |
|
cd->cdi.speed, |
|
buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ |
|
buffer[n + 3] & 0x20 ? "dvd-ram " : "", |
|
buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ |
|
buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ |
|
buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ |
|
loadmech[buffer[n + 6] >> 5]); |
|
if ((buffer[n + 6] >> 5) == 0) |
|
/* caddy drives can't close tray... */ |
|
cd->cdi.mask |= CDC_CLOSE_TRAY; |
|
if ((buffer[n + 2] & 0x8) == 0) |
|
/* not a DVD drive */ |
|
cd->cdi.mask |= CDC_DVD; |
|
if ((buffer[n + 3] & 0x20) == 0) |
|
/* can't write DVD-RAM media */ |
|
cd->cdi.mask |= CDC_DVD_RAM; |
|
if ((buffer[n + 3] & 0x10) == 0) |
|
/* can't write DVD-R media */ |
|
cd->cdi.mask |= CDC_DVD_R; |
|
if ((buffer[n + 3] & 0x2) == 0) |
|
/* can't write CD-RW media */ |
|
cd->cdi.mask |= CDC_CD_RW; |
|
if ((buffer[n + 3] & 0x1) == 0) |
|
/* can't write CD-R media */ |
|
cd->cdi.mask |= CDC_CD_R; |
|
if ((buffer[n + 6] & 0x8) == 0) |
|
/* can't eject */ |
|
cd->cdi.mask |= CDC_OPEN_TRAY; |
|
|
|
if ((buffer[n + 6] >> 5) == mechtype_individual_changer || |
|
(buffer[n + 6] >> 5) == mechtype_cartridge_changer) |
|
cd->cdi.capacity = |
|
cdrom_number_of_slots(&cd->cdi); |
|
if (cd->cdi.capacity <= 1) |
|
/* not a changer */ |
|
cd->cdi.mask |= CDC_SELECT_DISC; |
|
/*else I don't think it can close its tray |
|
cd->cdi.mask |= CDC_CLOSE_TRAY; */ |
|
|
|
/* |
|
* if DVD-RAM, MRW-W or CD-RW, we are randomly writable |
|
*/ |
|
if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != |
|
(CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { |
|
cd->writeable = 1; |
|
} |
|
|
|
kfree(buffer); |
|
} |
|
|
|
/* |
|
* sr_packet() is the entry point for the generic commands generated |
|
* by the Uniform CD-ROM layer. |
|
*/ |
|
static int sr_packet(struct cdrom_device_info *cdi, |
|
struct packet_command *cgc) |
|
{ |
|
struct scsi_cd *cd = cdi->handle; |
|
struct scsi_device *sdev = cd->device; |
|
|
|
if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) |
|
return -EDRIVE_CANT_DO_THIS; |
|
|
|
if (cgc->timeout <= 0) |
|
cgc->timeout = IOCTL_TIMEOUT; |
|
|
|
sr_do_ioctl(cd, cgc); |
|
|
|
return cgc->stat; |
|
} |
|
|
|
static int sr_read_cdda_bpc(struct cdrom_device_info *cdi, void __user *ubuf, |
|
u32 lba, u32 nr, u8 *last_sense) |
|
{ |
|
struct gendisk *disk = cdi->disk; |
|
u32 len = nr * CD_FRAMESIZE_RAW; |
|
struct scsi_request *req; |
|
struct request *rq; |
|
struct bio *bio; |
|
int ret; |
|
|
|
rq = blk_get_request(disk->queue, REQ_OP_DRV_IN, 0); |
|
if (IS_ERR(rq)) |
|
return PTR_ERR(rq); |
|
req = scsi_req(rq); |
|
|
|
ret = blk_rq_map_user(disk->queue, rq, NULL, ubuf, len, GFP_KERNEL); |
|
if (ret) |
|
goto out_put_request; |
|
|
|
req->cmd[0] = GPCMD_READ_CD; |
|
req->cmd[1] = 1 << 2; |
|
req->cmd[2] = (lba >> 24) & 0xff; |
|
req->cmd[3] = (lba >> 16) & 0xff; |
|
req->cmd[4] = (lba >> 8) & 0xff; |
|
req->cmd[5] = lba & 0xff; |
|
req->cmd[6] = (nr >> 16) & 0xff; |
|
req->cmd[7] = (nr >> 8) & 0xff; |
|
req->cmd[8] = nr & 0xff; |
|
req->cmd[9] = 0xf8; |
|
req->cmd_len = 12; |
|
rq->timeout = 60 * HZ; |
|
bio = rq->bio; |
|
|
|
blk_execute_rq(disk, rq, 0); |
|
if (scsi_req(rq)->result) { |
|
struct scsi_sense_hdr sshdr; |
|
|
|
scsi_normalize_sense(req->sense, req->sense_len, |
|
&sshdr); |
|
*last_sense = sshdr.sense_key; |
|
ret = -EIO; |
|
} |
|
|
|
if (blk_rq_unmap_user(bio)) |
|
ret = -EFAULT; |
|
out_put_request: |
|
blk_put_request(rq); |
|
return ret; |
|
} |
|
|
|
|
|
/** |
|
* sr_kref_release - Called to free the scsi_cd structure |
|
* @kref: pointer to embedded kref |
|
* |
|
* sr_ref_mutex must be held entering this routine. Because it is |
|
* called on last put, you should always use the scsi_cd_get() |
|
* scsi_cd_put() helpers which manipulate the semaphore directly |
|
* and never do a direct kref_put(). |
|
**/ |
|
static void sr_kref_release(struct kref *kref) |
|
{ |
|
struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); |
|
struct gendisk *disk = cd->disk; |
|
|
|
spin_lock(&sr_index_lock); |
|
clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
|
spin_unlock(&sr_index_lock); |
|
|
|
unregister_cdrom(&cd->cdi); |
|
|
|
disk->private_data = NULL; |
|
|
|
put_disk(disk); |
|
|
|
mutex_destroy(&cd->lock); |
|
|
|
kfree(cd); |
|
} |
|
|
|
static int sr_remove(struct device *dev) |
|
{ |
|
struct scsi_cd *cd = dev_get_drvdata(dev); |
|
|
|
scsi_autopm_get_device(cd->device); |
|
|
|
del_gendisk(cd->disk); |
|
dev_set_drvdata(dev, NULL); |
|
|
|
mutex_lock(&sr_ref_mutex); |
|
kref_put(&cd->kref, sr_kref_release); |
|
mutex_unlock(&sr_ref_mutex); |
|
|
|
return 0; |
|
} |
|
|
|
static int __init init_sr(void) |
|
{ |
|
int rc; |
|
|
|
rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); |
|
if (rc) |
|
return rc; |
|
rc = scsi_register_driver(&sr_template.gendrv); |
|
if (rc) |
|
unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
|
|
|
return rc; |
|
} |
|
|
|
static void __exit exit_sr(void) |
|
{ |
|
scsi_unregister_driver(&sr_template.gendrv); |
|
unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); |
|
} |
|
|
|
module_init(init_sr); |
|
module_exit(exit_sr); |
|
MODULE_LICENSE("GPL");
|
|
|