262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
#ifndef _SCSI_DISK_H
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#define _SCSI_DISK_H
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/*
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* More than enough for everybody ;) The huge number of majors
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* is a leftover from 16bit dev_t days, we don't really need that
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* much numberspace.
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*/
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#define SD_MAJORS 16
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/*
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* Time out in seconds for disks and Magneto-opticals (which are slower).
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*/
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#define SD_TIMEOUT (30 * HZ)
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#define SD_MOD_TIMEOUT (75 * HZ)
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/*
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* Flush timeout is a multiplier over the standard device timeout which is
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* user modifiable via sysfs but initially set to SD_TIMEOUT
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*/
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#define SD_FLUSH_TIMEOUT_MULTIPLIER 2
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#define SD_WRITE_SAME_TIMEOUT (120 * HZ)
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/*
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* Number of allowed retries
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*/
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#define SD_MAX_RETRIES 5
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#define SD_PASSTHROUGH_RETRIES 1
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#define SD_MAX_MEDIUM_TIMEOUTS 2
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/*
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* Size of the initial data buffer for mode and read capacity data
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*/
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#define SD_BUF_SIZE 512
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/*
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* Number of sectors at the end of the device to avoid multi-sector
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* accesses to in the case of last_sector_bug
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*/
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#define SD_LAST_BUGGY_SECTORS 8
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enum {
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SD_EXT_CDB_SIZE = 32, /* Extended CDB size */
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SD_MEMPOOL_SIZE = 2, /* CDB pool size */
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};
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enum {
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SD_DEF_XFER_BLOCKS = 0xffff,
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SD_MAX_XFER_BLOCKS = 0xffffffff,
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SD_MAX_WS10_BLOCKS = 0xffff,
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SD_MAX_WS16_BLOCKS = 0x7fffff,
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};
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enum {
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SD_LBP_FULL = 0, /* Full logical block provisioning */
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SD_LBP_UNMAP, /* Use UNMAP command */
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SD_LBP_WS16, /* Use WRITE SAME(16) with UNMAP bit */
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SD_LBP_WS10, /* Use WRITE SAME(10) with UNMAP bit */
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SD_LBP_ZERO, /* Use WRITE SAME(10) with zero payload */
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SD_LBP_DISABLE, /* Discard disabled due to failed cmd */
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};
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struct scsi_disk {
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struct scsi_driver *driver; /* always &sd_template */
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struct scsi_device *device;
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struct device dev;
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struct gendisk *disk;
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atomic_t openers;
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sector_t capacity; /* size in 512-byte sectors */
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u32 max_xfer_blocks;
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u32 max_ws_blocks;
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u32 max_unmap_blocks;
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u32 unmap_granularity;
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u32 unmap_alignment;
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u32 index;
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unsigned int physical_block_size;
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unsigned int max_medium_access_timeouts;
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unsigned int medium_access_timed_out;
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u8 media_present;
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u8 write_prot;
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u8 protection_type;/* Data Integrity Field */
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u8 provisioning_mode;
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unsigned ATO : 1; /* state of disk ATO bit */
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unsigned cache_override : 1; /* temp override of WCE,RCD */
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unsigned WCE : 1; /* state of disk WCE bit */
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unsigned RCD : 1; /* state of disk RCD bit, unused */
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unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
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unsigned first_scan : 1;
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unsigned lbpme : 1;
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unsigned lbprz : 1;
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unsigned lbpu : 1;
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unsigned lbpws : 1;
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unsigned lbpws10 : 1;
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unsigned lbpvpd : 1;
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unsigned ws10 : 1;
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unsigned ws16 : 1;
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};
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#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
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static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
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{
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return container_of(disk->private_data, struct scsi_disk, driver);
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}
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#define sd_printk(prefix, sdsk, fmt, a...) \
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(sdsk)->disk ? \
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sdev_printk(prefix, (sdsk)->device, "[%s] " fmt, \
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(sdsk)->disk->disk_name, ##a) : \
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sdev_printk(prefix, (sdsk)->device, fmt, ##a)
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#define sd_first_printk(prefix, sdsk, fmt, a...) \
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do { \
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if ((sdkp)->first_scan) \
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sd_printk(prefix, sdsk, fmt, ##a); \
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} while (0)
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static inline int scsi_medium_access_command(struct scsi_cmnd *scmd)
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{
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switch (scmd->cmnd[0]) {
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case READ_6:
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case READ_10:
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case READ_12:
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case READ_16:
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case SYNCHRONIZE_CACHE:
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case VERIFY:
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case VERIFY_12:
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case VERIFY_16:
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case WRITE_6:
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case WRITE_10:
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case WRITE_12:
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case WRITE_16:
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case WRITE_SAME:
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case WRITE_SAME_16:
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case UNMAP:
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return 1;
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case VARIABLE_LENGTH_CMD:
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switch (scmd->cmnd[9]) {
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case READ_32:
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case VERIFY_32:
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case WRITE_32:
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case WRITE_SAME_32:
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return 1;
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}
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}
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return 0;
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}
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/*
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* A DIF-capable target device can be formatted with different
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* protection schemes. Currently 0 through 3 are defined:
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*
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* Type 0 is regular (unprotected) I/O
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*
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* Type 1 defines the contents of the guard and reference tags
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*
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* Type 2 defines the contents of the guard and reference tags and
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* uses 32-byte commands to seed the latter
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*
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* Type 3 defines the contents of the guard tag only
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*/
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enum sd_dif_target_protection_types {
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SD_DIF_TYPE0_PROTECTION = 0x0,
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SD_DIF_TYPE1_PROTECTION = 0x1,
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SD_DIF_TYPE2_PROTECTION = 0x2,
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SD_DIF_TYPE3_PROTECTION = 0x3,
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};
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/*
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* Look up the DIX operation based on whether the command is read or
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* write and whether dix and dif are enabled.
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*/
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static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
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{
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/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
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const unsigned int ops[] = { /* wrt dix dif */
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SCSI_PROT_NORMAL, /* 0 0 0 */
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SCSI_PROT_READ_STRIP, /* 0 0 1 */
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SCSI_PROT_READ_INSERT, /* 0 1 0 */
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SCSI_PROT_READ_PASS, /* 0 1 1 */
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SCSI_PROT_NORMAL, /* 1 0 0 */
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SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
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SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
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SCSI_PROT_WRITE_PASS, /* 1 1 1 */
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};
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return ops[write << 2 | dix << 1 | dif];
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}
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/*
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* Returns a mask of the protection flags that are valid for a given DIX
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* operation.
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*/
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static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
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{
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const unsigned int flag_mask[] = {
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[SCSI_PROT_NORMAL] = 0,
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[SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
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SCSI_PROT_GUARD_CHECK |
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SCSI_PROT_REF_CHECK |
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SCSI_PROT_REF_INCREMENT,
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[SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
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SCSI_PROT_IP_CHECKSUM,
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[SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
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SCSI_PROT_GUARD_CHECK |
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SCSI_PROT_REF_CHECK |
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SCSI_PROT_REF_INCREMENT |
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SCSI_PROT_IP_CHECKSUM,
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[SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
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SCSI_PROT_REF_INCREMENT,
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[SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
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SCSI_PROT_REF_CHECK |
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SCSI_PROT_REF_INCREMENT |
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SCSI_PROT_IP_CHECKSUM,
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[SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
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SCSI_PROT_GUARD_CHECK |
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SCSI_PROT_REF_CHECK |
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SCSI_PROT_REF_INCREMENT |
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SCSI_PROT_IP_CHECKSUM,
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};
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return flag_mask[prot_op];
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}
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/*
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* Data Integrity Field tuple.
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*/
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struct sd_dif_tuple {
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__be16 guard_tag; /* Checksum */
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__be16 app_tag; /* Opaque storage */
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__be32 ref_tag; /* Target LBA or indirect LBA */
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};
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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extern void sd_dif_config_host(struct scsi_disk *);
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extern void sd_dif_prepare(struct scsi_cmnd *scmd);
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extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
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#else /* CONFIG_BLK_DEV_INTEGRITY */
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static inline void sd_dif_config_host(struct scsi_disk *disk)
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{
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}
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static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
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{
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return 0;
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}
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static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
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{
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}
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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#endif /* _SCSI_DISK_H */
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