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[SCSI] Support devices with protection information

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Implement support for DMA of protection information for devices that
are data integrity capable.

 - Add support for mapping an extra scatter-gather list containing
   the protection information.

 - Allocate protection scsi_data_buffer if host is DIX (integrity DMA)
   capable.

 - Accessor function for checking whether a device has protection
   enabled.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin K. Petersen
2008-07-17 17:08:48 -04:00
committed by James Bottomley
parent db007fc5e2
commit 7027ad72a6
5 changed files with 84 additions and 3 deletions
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5
include/scsi/scsi_device.h
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@ -423,6 +423,11 @@ static inline int scsi_device_enclosure(struct scsi_device *sdev)
return sdev->inquiry[6] & (1<<6);
}
static inline int scsi_device_protection(struct scsi_device *sdev)
{
return sdev->inquiry[5] & (1<<0);
}
#define MODULE_ALIAS_SCSI_DEVICE(type) \
MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"