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  * This is limited by the naming scheme enforced in sd_probe,
  13  * add another character to it if you really need more disks.
  14  */
  15 #define SD_MAX_DISKS    (((26 * 26) + 26 + 1) * 26)
  16
  17 /*
  18  * Time out in seconds for disks and Magneto-opticals (which are slower).
  19  */
  20 #define SD_TIMEOUT              (30 * HZ)
  21 #define SD_MOD_TIMEOUT          (75 * HZ)
  22 #define SD_FLUSH_TIMEOUT        (60 * HZ)
  23
  24 /*
  25  * Number of allowed retries
  26  */
  27 #define SD_MAX_RETRIES          5
  28 #define SD_PASSTHROUGH_RETRIES  1
  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
  41 enum {
  42         SD_EXT_CDB_SIZE = 32,   /* Extended CDB size */
  43         SD_MEMPOOL_SIZE = 2,    /* CDB pool size */
  44 };
  45
  46 enum {
  47         SD_LBP_FULL = 0,        /* Full logical block provisioning */
  48         SD_LBP_UNMAP,           /* Use UNMAP command */
  49         SD_LBP_WS16,            /* Use WRITE SAME(16) with UNMAP bit */
  50         SD_LBP_WS10,            /* Use WRITE SAME(10) with UNMAP bit */
  51         SD_LBP_ZERO,            /* Use WRITE SAME(10) with zero payload */
  52         SD_LBP_DISABLE,         /* Discard disabled due to failed cmd */
  53 };
  54
  55 struct scsi_disk {
  56         struct scsi_driver *driver;     /* always &sd_template */
  57         struct scsi_device *device;
  58         struct device   dev;
  59         struct gendisk  *disk;
  60         atomic_t        openers;
  61         sector_t        capacity;       /* size in 512-byte sectors */
  62         u32             max_ws_blocks;
  63         u32             max_unmap_blocks;
  64         u32             unmap_granularity;
  65         u32             unmap_alignment;
  66         u32             index;
  67         unsigned int    physical_block_size;
  68         u8              media_present;
  69         u8              write_prot;
  70         u8              protection_type;/* Data Integrity Field */
  71         u8              provisioning_mode;
  72         unsigned        ATO : 1;        /* state of disk ATO bit */
  73         unsigned        WCE : 1;        /* state of disk WCE bit */
  74         unsigned        RCD : 1;        /* state of disk RCD bit, unused */
  75         unsigned        DPOFUA : 1;     /* state of disk DPOFUA bit */
  76         unsigned        first_scan : 1;
  77         unsigned        lbpme : 1;
  78         unsigned        lbprz : 1;
  79         unsigned        lbpu : 1;
  80         unsigned        lbpws : 1;
  81         unsigned        lbpws10 : 1;
  82         unsigned        lbpvpd : 1;
  83 };
  84 #define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
  85
  86 static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
  87 {
  88         return container_of(disk->private_data, struct scsi_disk, driver);
  89 }
  90
  91 #define sd_printk(prefix, sdsk, fmt, a...)                              \
  92         (sdsk)->disk ?                                                  \
  93         sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,                \
  94                     (sdsk)->disk->disk_name, ##a) :                     \
  95         sdev_printk(prefix, (sdsk)->device, fmt, ##a)
  96
  97 /*
  98  * A DIF-capable target device can be formatted with different
  99  * protection schemes.  Currently 0 through 3 are defined:
 100  *
 101  * Type 0 is regular (unprotected) I/O
 102  *
 103  * Type 1 defines the contents of the guard and reference tags
 104  *
 105  * Type 2 defines the contents of the guard and reference tags and
 106  * uses 32-byte commands to seed the latter
 107  *
 108  * Type 3 defines the contents of the guard tag only
 109  */
 110
 111 enum sd_dif_target_protection_types {
 112         SD_DIF_TYPE0_PROTECTION = 0x0,
 113         SD_DIF_TYPE1_PROTECTION = 0x1,
 114         SD_DIF_TYPE2_PROTECTION = 0x2,
 115         SD_DIF_TYPE3_PROTECTION = 0x3,
 116 };
 117
 118 /*
 119  * Data Integrity Field tuple.
 120  */
 121 struct sd_dif_tuple {
 122        __be16 guard_tag;        /* Checksum */
 123        __be16 app_tag;          /* Opaque storage */
 124        __be32 ref_tag;          /* Target LBA or indirect LBA */
 125 };
 126
 127 #ifdef CONFIG_BLK_DEV_INTEGRITY
 128
 129 extern void sd_dif_config_host(struct scsi_disk *);
 130 extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 131 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 132
 133 #else /* CONFIG_BLK_DEV_INTEGRITY */
 134
 135 static inline void sd_dif_config_host(struct scsi_disk *disk)
 136 {
 137 }
 138 static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 139 {
 140         return 0;
 141 }
 142 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 143 {
 144 }
 145
 146 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 147
 148 #endif /* _SCSI_DISK_H */