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/*
  17 * Flush timeout is a multiplier over the standard device timeout which is
  18 * user modifiable via sysfs but initially set to SD_TIMEOUT
  19 */
  20#define SD_FLUSH_TIMEOUT_MULTIPLIER     2
  21#define SD_WRITE_SAME_TIMEOUT   (120 * HZ)
  22
  23/*
  24 * Number of allowed retries
  25 */
  26#define SD_MAX_RETRIES          5
  27#define SD_PASSTHROUGH_RETRIES  1
  28#define SD_MAX_MEDIUM_TIMEOUTS  2
  29
  30/*
  31 * Size of the initial data buffer for mode and read capacity data
  32 */
  33#define SD_BUF_SIZE             512
  34
  35/*
  36 * Number of sectors at the end of the device to avoid multi-sector
  37 * accesses to in the case of last_sector_bug
  38 */
  39#define SD_LAST_BUGGY_SECTORS   8
  40
  41enum {
  42        SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  43        SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  44};
  45
  46enum {
  47        SD_MAX_WS10_BLOCKS = 0xffff,
  48        SD_MAX_WS16_BLOCKS = 0x7fffff,
  49};
  50
  51enum {
  52        SD_LBP_FULL = 0,        /* Full logical block provisioning */
  53        SD_LBP_UNMAP,           /* Use UNMAP command */
  54        SD_LBP_WS16,            /* Use WRITE SAME(16) with UNMAP bit */
  55        SD_LBP_WS10,            /* Use WRITE SAME(10) with UNMAP bit */
  56        SD_LBP_ZERO,            /* Use WRITE SAME(10) with zero payload */
  57        SD_LBP_DISABLE,         /* Discard disabled due to failed cmd */
  58};
  59
  60struct scsi_disk {
  61        struct scsi_driver *driver;     /* always &sd_template */
  62        struct scsi_device *device;
  63        struct device   dev;
  64        struct gendisk  *disk;
  65        atomic_t        openers;
  66        sector_t        capacity;       /* size in 512-byte sectors */
  67        u32             max_ws_blocks;
  68        u32             max_unmap_blocks;
  69        u32             unmap_granularity;
  70        u32             unmap_alignment;
  71        u32             index;
  72        unsigned int    physical_block_size;
  73        unsigned int    max_medium_access_timeouts;
  74        unsigned int    medium_access_timed_out;
  75        u8              media_present;
  76        u8              write_prot;
  77        u8              protection_type;/* Data Integrity Field */
  78        u8              provisioning_mode;
  79        unsigned        ATO : 1;        /* state of disk ATO bit */
  80        unsigned        cache_override : 1; /* temp override of WCE,RCD */
  81        unsigned        WCE : 1;        /* state of disk WCE bit */
  82        unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  83        unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  84        unsigned        first_scan : 1;
  85        unsigned        lbpme : 1;
  86        unsigned        lbprz : 1;
  87        unsigned        lbpu : 1;
  88        unsigned        lbpws : 1;
  89        unsigned        lbpws10 : 1;
  90        unsigned        lbpvpd : 1;
  91        unsigned        ws10 : 1;
  92        unsigned        ws16 : 1;
  93};
  94#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  95
  96static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  97{
  98        return container_of(disk->private_data, struct scsi_disk, driver);
  99}
 100
 101#define sd_printk(prefix, sdsk, fmt, a...)                              \
 102        (sdsk)->disk ?                                                  \
 103        sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
 104                    (sdsk)->disk->disk_name, ##a) :                     \
 105        sdev_printk(prefix, (sdsk)->device, fmt, ##a)
 106
 107#define sd_first_printk(prefix, sdsk, fmt, a...)                        \
 108        do {                                                            \
 109                if ((sdkp)->first_scan)                                 \
 110                        sd_printk(prefix, sdsk, fmt, ##a);              \
 111        } while (0)
 112
 113static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
 114{
 115        switch (scmd->cmnd[0]) {
 116        case READ_6:
 117        case READ_10:
 118        case READ_12:
 119        case READ_16:
 120        case SYNCHRONIZE_CACHE:
 121        case VERIFY:
 122        case VERIFY_12:
 123        case VERIFY_16:
 124        case WRITE_6:
 125        case WRITE_10:
 126        case WRITE_12:
 127        case WRITE_16:
 128        case WRITE_SAME:
 129        case WRITE_SAME_16:
 130        case UNMAP:
 131                return 1;
 132        case VARIABLE_LENGTH_CMD:
 133                switch (scmd->cmnd[9]) {
 134                case READ_32:
 135                case VERIFY_32:
 136                case WRITE_32:
 137                case WRITE_SAME_32:
 138                        return 1;
 139                }
 140        }
 141
 142        return 0;
 143}
 144
 145/*
 146 * A DIF-capable target device can be formatted with different
 147 * protection schemes.  Currently 0 through 3 are defined:
 148 *
 149 * Type 0 is regular (unprotected) I/O
 150 *
 151 * Type 1 defines the contents of the guard and reference tags
 152 *
 153 * Type 2 defines the contents of the guard and reference tags and
 154 * uses 32-byte commands to seed the latter
 155 *
 156 * Type 3 defines the contents of the guard tag only
 157 */
 158
 159enum sd_dif_target_protection_types {
 160        SD_DIF_TYPE0_PROTECTION = 0x0,
 161        SD_DIF_TYPE1_PROTECTION = 0x1,
 162        SD_DIF_TYPE2_PROTECTION = 0x2,
 163        SD_DIF_TYPE3_PROTECTION = 0x3,
 164};
 165
 166/*
 167 * Data Integrity Field tuple.
 168 */
 169struct sd_dif_tuple {
 170       __be16 guard_tag;        /* Checksum */
 171       __be16 app_tag;          /* Opaque storage */
 172       __be32 ref_tag;          /* Target LBA or indirect LBA */
 173};
 174
 175#ifdef CONFIG_BLK_DEV_INTEGRITY
 176
 177extern void sd_dif_config_host(struct scsi_disk *);
 178extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 179extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 180
 181#else /* CONFIG_BLK_DEV_INTEGRITY */
 182
 183static inline void sd_dif_config_host(struct scsi_disk *disk)
 184{
 185}
 186static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 187{
 188        return 0;
 189}
 190static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 191{
 192}
 193
 194#endif /* CONFIG_BLK_DEV_INTEGRITY */
 195
 196#endif /* _SCSI_DISK_H */
 197