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 */ 191