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