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