linux/drivers/scsi/sd.h
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   1#ifndef _SCSI_DISK_H
   2#define _SCSI_DISK_H
   3
   4/*
   5 * More than enough for everybody ;)  The huge number of majors
   6 * is a leftover from 16bit dev_t days, we don't really need that
   7 * much numberspace.
   8 */
   9#define SD_MAJORS       16
  10
  11/*
  12 * Time out in seconds for disks and Magneto-opticals (which are slower).
  13 */
  14#define SD_TIMEOUT              (30 * HZ)
  15#define SD_MOD_TIMEOUT          (75 * HZ)
  16#define SD_FLUSH_TIMEOUT        (60 * HZ)
  17#define SD_WRITE_SAME_TIMEOUT   (120 * HZ)
  18
  19/*
  20 * Number of allowed retries
  21 */
  22#define SD_MAX_RETRIES          5
  23#define SD_PASSTHROUGH_RETRIES  1
  24#define SD_MAX_MEDIUM_TIMEOUTS  2
  25
  26/*
  27 * Size of the initial data buffer for mode and read capacity data
  28 */
  29#define SD_BUF_SIZE             512
  30
  31/*
  32 * Number of sectors at the end of the device to avoid multi-sector
  33 * accesses to in the case of last_sector_bug
  34 */
  35#define SD_LAST_BUGGY_SECTORS   8
  36
  37enum {
  38        SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  39        SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  40};
  41
  42enum {
  43        SD_MAX_WS10_BLOCKS = 0xffff,
  44        SD_MAX_WS16_BLOCKS = 0x7fffff,
  45};
  46
  47enum {
  48        SD_LBP_FULL = 0,        /* Full logical block provisioning */
  49        SD_LBP_UNMAP,           /* Use UNMAP command */
  50        SD_LBP_WS16,            /* Use WRITE SAME(16) with UNMAP bit */
  51        SD_LBP_WS10,            /* Use WRITE SAME(10) with UNMAP bit */
  52        SD_LBP_ZERO,            /* Use WRITE SAME(10) with zero payload */
  53        SD_LBP_DISABLE,         /* Discard disabled due to failed cmd */
  54};
  55
  56struct scsi_disk {
  57        struct scsi_driver *driver;     /* always &sd_template */
  58        struct scsi_device *device;
  59        struct device   dev;
  60        struct gendisk  *disk;
  61        atomic_t        openers;
  62        sector_t        capacity;       /* size in 512-byte sectors */
  63        u32             max_ws_blocks;
  64        u32             max_unmap_blocks;
  65        u32             unmap_granularity;
  66        u32             unmap_alignment;
  67        u32             index;
  68        unsigned int    physical_block_size;
  69        unsigned int    max_medium_access_timeouts;
  70        unsigned int    medium_access_timed_out;
  71        u8              media_present;
  72        u8              write_prot;
  73        u8              protection_type;/* Data Integrity Field */
  74        u8              provisioning_mode;
  75        unsigned        ATO : 1;        /* state of disk ATO bit */
  76        unsigned        WCE : 1;        /* state of disk WCE bit */
  77        unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  78        unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  79        unsigned        first_scan : 1;
  80        unsigned        lbpme : 1;
  81        unsigned        lbprz : 1;
  82        unsigned        lbpu : 1;
  83        unsigned        lbpws : 1;
  84        unsigned        lbpws10 : 1;
  85        unsigned        lbpvpd : 1;
  86        unsigned        ws16 : 1;
  87};
  88#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  89
  90static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  91{
  92        return container_of(disk->private_data, struct scsi_disk, driver);
  93}
  94
  95#define sd_printk(prefix, sdsk, fmt, a...)                              \
  96        (sdsk)->disk ?                                                  \
  97        sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  98                    (sdsk)->disk->disk_name, ##a) :                     \
  99        sdev_printk(prefix, (sdsk)->device, fmt, ##a)
 100
 101static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
 102{
 103        switch (scmd->cmnd[0]) {
 104        case READ_6:
 105        case READ_10:
 106        case READ_12:
 107        case READ_16:
 108        case SYNCHRONIZE_CACHE:
 109        case VERIFY:
 110        case VERIFY_12:
 111        case VERIFY_16:
 112        case WRITE_6:
 113        case WRITE_10:
 114        case WRITE_12:
 115        case WRITE_16:
 116        case WRITE_SAME:
 117        case WRITE_SAME_16:
 118        case UNMAP:
 119                return 1;
 120        case VARIABLE_LENGTH_CMD:
 121                switch (scmd->cmnd[9]) {
 122                case READ_32:
 123                case VERIFY_32:
 124                case WRITE_32:
 125                case WRITE_SAME_32:
 126                        return 1;
 127                }
 128        }
 129
 130        return 0;
 131}
 132
 133/*
 134 * A DIF-capable target device can be formatted with different
 135 * protection schemes.  Currently 0 through 3 are defined:
 136 *
 137 * Type 0 is regular (unprotected) I/O
 138 *
 139 * Type 1 defines the contents of the guard and reference tags
 140 *
 141 * Type 2 defines the contents of the guard and reference tags and
 142 * uses 32-byte commands to seed the latter
 143 *
 144 * Type 3 defines the contents of the guard tag only
 145 */
 146
 147enum sd_dif_target_protection_types {
 148        SD_DIF_TYPE0_PROTECTION = 0x0,
 149        SD_DIF_TYPE1_PROTECTION = 0x1,
 150        SD_DIF_TYPE2_PROTECTION = 0x2,
 151        SD_DIF_TYPE3_PROTECTION = 0x3,
 152};
 153
 154/*
 155 * Data Integrity Field tuple.
 156 */
 157struct sd_dif_tuple {
 158       __be16 guard_tag;        /* Checksum */
 159       __be16 app_tag;          /* Opaque storage */
 160       __be32 ref_tag;          /* Target LBA or indirect LBA */
 161};
 162
 163#ifdef CONFIG_BLK_DEV_INTEGRITY
 164
 165extern void sd_dif_config_host(struct scsi_disk *);
 166extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 167extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 168
 169#else /* CONFIG_BLK_DEV_INTEGRITY */
 170
 171static inline void sd_dif_config_host(struct scsi_disk *disk)
 172{
 173}
 174static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 175{
 176        return 0;
 177}
 178static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 179{
 180}
 181
 182#endif /* CONFIG_BLK_DEV_INTEGRITY */
 183
 184#endif /* _SCSI_DISK_H */
 185
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