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scsi: cxlflash: Use derived maximum write same length

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The existing write same routine within the cxlflash driver uses a
statically defined value for the maximum write same transfer length.
While this is close to the value reflected by the original device that
was supported by cxlflash, newer devices are capable of much larger
lengths. Supporting what the device is capable of offers substantial
performance improvement as the scrub routine within cxlflash operates on
'chunk size' units (256MB with a 4K sector size).

Instead of a #define, use the write same maximum length that is stored
in the block layer in units of 512 byte sectors. This value is initially
determined from the block limits VPD page during device discovery and
can also be manipulated from sysfs. As a general cleanup, designate the
timeout used when executing the write same command as constant.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs
2017-10-25 16:35:57 -05:00
committed by Martin K. Petersen
parent 4a6125c503
commit 285e6670d0
2 changed files with 4 additions and 5 deletions
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3
drivers/scsi/cxlflash/sislite.h
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@@ -548,7 +548,4 @@ struct sisl_rht_entry_f1 {
#define TMF_LUN_RESET 0x1U
#define TMF_CLEAR_ACA 0x2U
#define SISLITE_MAX_WS_BLOCKS 512
#endif /* _SISLITE_H */