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
  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_MAX_WS10_BLOCKS = 0xffff,
  48         SD_MAX_WS16_BLOCKS = 0x7fffff,
  49 };
  50
  51 enum {
  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
  60 struct 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
  96 static 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 static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
 108 {
 109         switch (scmd->cmnd[0]) {
 110         case READ_6:
 111         case READ_10:
 112         case READ_12:
 113         case READ_16:
 114         case SYNCHRONIZE_CACHE:
 115         case VERIFY:
 116         case VERIFY_12:
 117         case VERIFY_16:
 118         case WRITE_6:
 119         case WRITE_10:
 120         case WRITE_12:
 121         case WRITE_16:
 122         case WRITE_SAME:
 123         case WRITE_SAME_16:
 124         case UNMAP:
 125                 return 1;
 126         case VARIABLE_LENGTH_CMD:
 127                 switch (scmd->cmnd[9]) {
 128                 case READ_32:
 129                 case VERIFY_32:
 130                 case WRITE_32:
 131                 case WRITE_SAME_32:
 132                         return 1;
 133                 }
 134         }
 135
 136         return 0;
 137 }
 138
 139 /*
 140  * A DIF-capable target device can be formatted with different
 141  * protection schemes.  Currently 0 through 3 are defined:
 142  *
 143  * Type 0 is regular (unprotected) I/O
 144  *
 145  * Type 1 defines the contents of the guard and reference tags
 146  *
 147  * Type 2 defines the contents of the guard and reference tags and
 148  * uses 32-byte commands to seed the latter
 149  *
 150  * Type 3 defines the contents of the guard tag only
 151  */
 152
 153 enum sd_dif_target_protection_types {
 154         SD_DIF_TYPE0_PROTECTION = 0x0,
 155         SD_DIF_TYPE1_PROTECTION = 0x1,
 156         SD_DIF_TYPE2_PROTECTION = 0x2,
 157         SD_DIF_TYPE3_PROTECTION = 0x3,
 158 };
 159
 160 /*
 161  * Data Integrity Field tuple.
 162  */
 163 struct sd_dif_tuple {
 164        __be16 guard_tag;        /* Checksum */
 165        __be16 app_tag;          /* Opaque storage */
 166        __be32 ref_tag;          /* Target LBA or indirect LBA */
 167 };
 168
 169 #ifdef CONFIG_BLK_DEV_INTEGRITY
 170
 171 extern void sd_dif_config_host(struct scsi_disk *);
 172 extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
 173 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 174
 175 #else /* CONFIG_BLK_DEV_INTEGRITY */
 176
 177 static inline void sd_dif_config_host(struct scsi_disk *disk)
 178 {
 179 }
 180 static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
 181 {
 182         return 0;
 183 }
 184 static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
 185 {
 186 }
 187
 188 #endif /* CONFIG_BLK_DEV_INTEGRITY */
 189
 190 #endif /* _SCSI_DISK_H */