| 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 */ |