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
  36 enum {
  37         SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  38         SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  39 };
  40
  41 enum {
  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
  50 struct 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
  83 static 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
  94 static 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
 140 enum 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  */
 150 struct 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
 158 extern void sd_dif_config_host(struct scsi_disk *);
 159 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 160 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 161
 162 #else /* CONFIG_BLK_DEV_INTEGRITY */
 163
 164 static inline void sd_dif_config_host(struct scsi_disk *disk)
 165 {
 166 }
 167 static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 168 {
 169         return 0;
 170 }
 171 static 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 */