Christoph Hellwig wrote:
On Tue, Aug 23, 2005 at 07:22:59PM -0400, Luben Tuikov wrote:
On 08/22/05 01:12, Douglas Gilbert wrote:
I was surprised how much code needed changing.
With MODE SELECT's issues with libata addressed
various other SAT "extras" should be much easier
to implement. That should make libata more attractive
as a SAT layer for SAS LLDDs (that don't do it already
in firmware).
Doug, how about never needing a SAT layer for SAS LLDDs
for ATA/ATAPI devices.
Would you object if I "give" you a "domain device" to which
you can send FISes (+ the packet if ATAPI) through
a SAM-4 intefrace: Execute Task + TMFs?
Personally I think that would be nice, but when I mentioned the basic idea
(sending FISes through BLOCK_PC block later commands and let the scsi layer
handle then as vendor-specific commands) Jeff didn't like that because
then we'd need a non-sd upper driver although using the scsi midlayer.
That's something different than when Luben was talking about.
Addressing what you [Christoph] are talking about, the block layer needs
to grow a generic method for submitting device commands, be they ATA,
SCSI, SCSI w/ variable-length CDB, I2O, Promise SX8 message, whatever.
Stuff that into the request_queue, and the transport driver handles it
from there.
Jeff
-
: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
