mac_scsi: Fix pseudo DMA implementation

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Fix various issues: Comments about bus errors are incorrect. The
PDMA asm must return the size of the memory access that faulted so the
transfer count can be adjusted accordingly. A phase change may cause a
bus error but should not be treated as failure. A bus error does not
always imply a phase change and generally the transfer may continue.
Scatter/gather doesn't seem to work with PDMA due to overruns. This is
a pity because peak throughput seems to double with SG_ALL.
Tested on a Mac LC III and a PowerBook 520.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Finn Thain 2016-03-23 21:10:31 +11:00 • committed by Martin K. Petersen

parent ded155b5e4

commit 3a0f64bfa9

2 changed files with 119 additions and 95 deletions

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drivers/scsi/NCR5380.h

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204

drivers/scsi/mac_scsi.c

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