LXR linux/drivers/scsi/sd.h

   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
  18/*
  19 * Number of allowed retries
  20 */
  21#define SD_MAX_RETRIES          5
  22#define SD_PASSTHROUGH_RETRIES  1
  23#define SD_MAX_MEDIUM_TIMEOUTS  2
  24
  25/*
  26 * Size of the initial data buffer for mode and read capacity data
  27 */
  28#define SD_BUF_SIZE             512
  29
  30/*
  31 * Number of sectors at the end of the device to avoid multi-sector
  32 * accesses to in the case of last_sector_bug
  33 */
  34#define SD_LAST_BUGGY_SECTORS   8
  35
  36enum {
  37        SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  38        SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  39};
  40
  41enum {
  42        SD_LBP_FULL = 0,        /* Full logical block provisioning */
  43        SD_LBP_UNMAP,           /* Use UNMAP command */
  44        SD_LBP_WS16,            /* Use WRITE SAME(16) with UNMAP bit */
  45        SD_LBP_WS10,            /* Use WRITE SAME(10) with UNMAP bit */
  46        SD_LBP_ZERO,            /* Use WRITE SAME(10) with zero payload */
  47        SD_LBP_DISABLE,         /* Discard disabled due to failed cmd */
  48};
  49
  50struct scsi_disk {
  51        struct scsi_driver *driver;     /* always &sd_template */
  52        struct scsi_device *device;
  53        struct device   dev;
  54        struct gendisk  *disk;
  55        atomic_t        openers;
  56        sector_t        capacity;       /* size in 512-byte sectors */
  57        u32             max_ws_blocks;
  58        u32             max_unmap_blocks;
  59        u32             unmap_granularity;
  60        u32             unmap_alignment;
  61        u32             index;
  62        unsigned int    physical_block_size;
  63        unsigned int    max_medium_access_timeouts;
  64        unsigned int    medium_access_timed_out;
  65        u8              media_present;
  66        u8              write_prot;
  67        u8              protection_type;/* Data Integrity Field */
  68        u8              provisioning_mode;
  69        unsigned        ATO : 1;        /* state of disk ATO bit */
  70        unsigned        WCE : 1;        /* state of disk WCE bit */
  71        unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  72        unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  73        unsigned        first_scan : 1;
  74        unsigned        lbpme : 1;
  75        unsigned        lbprz : 1;
  76        unsigned        lbpu : 1;
  77        unsigned        lbpws : 1;
  78        unsigned        lbpws10 : 1;
  79        unsigned        lbpvpd : 1;
  80};
  81#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  82
  83static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  84{
  85        return container_of(disk->private_data, struct scsi_disk, driver);
  86}
  87
  88#define sd_printk(prefix, sdsk, fmt, a...)                              \
  89        (sdsk)->disk ?                                                  \
  90        sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  91                    (sdsk)->disk->disk_name, ##a) :                     \
  92        sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  93
  94static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
  95{
  96        switch (scmd->cmnd[0]) {
  97        case READ_6:
  98        case READ_10:
  99        case READ_12:
 100        case READ_16:
 101        case SYNCHRONIZE_CACHE:
 102        case VERIFY:
 103        case VERIFY_12:
 104        case VERIFY_16:
 105        case WRITE_6:
 106        case WRITE_10:
 107        case WRITE_12:
 108        case WRITE_16:
 109        case WRITE_SAME:
 110        case WRITE_SAME_16:
 111        case UNMAP:
 112                return 1;
 113        case VARIABLE_LENGTH_CMD:
 114                switch (scmd->cmnd[9]) {
 115                case READ_32:
 116                case VERIFY_32:
 117                case WRITE_32:
 118                case WRITE_SAME_32:
 119                        return 1;
 120                }
 121        }
 122
 123        return 0;
 124}
 125
 126/*
 127 * A DIF-capable target device can be formatted with different
 128 * protection schemes.  Currently 0 through 3 are defined:
 129 *
 130 * Type 0 is regular (unprotected) I/O
 131 *
 132 * Type 1 defines the contents of the guard and reference tags
 133 *
 134 * Type 2 defines the contents of the guard and reference tags and
 135 * uses 32-byte commands to seed the latter
 136 *
 137 * Type 3 defines the contents of the guard tag only
 138 */
 139
 140enum sd_dif_target_protection_types {
 141        SD_DIF_TYPE0_PROTECTION = 0x0,
 142        SD_DIF_TYPE1_PROTECTION = 0x1,
 143        SD_DIF_TYPE2_PROTECTION = 0x2,
 144        SD_DIF_TYPE3_PROTECTION = 0x3,
 145};
 146
 147/*
 148 * Data Integrity Field tuple.
 149 */
 150struct sd_dif_tuple {
 151       __be16 guard_tag;        /* Checksum */
 152       __be16 app_tag;          /* Opaque storage */
 153       __be32 ref_tag;          /* Target LBA or indirect LBA */
 154};
 155
 156#ifdef CONFIG_BLK_DEV_INTEGRITY
 157
 158extern void sd_dif_config_host(struct scsi_disk *);
 159extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 160extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 161
 162#else /* CONFIG_BLK_DEV_INTEGRITY */
 163
 164static inline void sd_dif_config_host(struct scsi_disk *disk)
 165{
 166}
 167static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 168{
 169        return 0;
 170}
 171static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 172{
 173}
 174
 175#endif /* CONFIG_BLK_DEV_INTEGRITY */
 176
 177#endif /* _SCSI_DISK_H */
 178