On 11/24/05, Jeff Garzik <jgarzik@xxxxxxxxx> wrote: > Douglas Gilbert wrote: > > I don't think a SATL is that easy. One SCSI command can > > translate into zero or more ATA commands. If it translates > > to multiple commands, then there is the possibility of an > > error prior to the last in the sequence of ATA commands > > (how to report; rollback needed ?). The SATL needs to hold > > state and needs a service thread if it is to support the > > IMMED bit on some commands (e.g. START STOP UNIT). > > It needs a conceptual service thread, not necessarily an explicit one. > > With REQUEST SENSE, I've demonstrated how to report errors with each > step in the sequence. With demo patches I've posted, I've demonstrated > (using qc->private_data) how to hold state. > > > > libata still has a ways to go to catch up to SAT rev 7 > > but has made some good progress lately with the addition > > of the ATA pass through commands (lk 2.6.15-rc1 and onward). > > smartmontools (just prior to 5.34) now works with '-d ata' > > on libata-connected SATA disks. The '-d ata' ** overrides > > the guess of a SCSI disk based on the device node (e.g. > > /dev/sda) and uses the HDIO_DRIVE_CMD and HDIO_DRIVE_TASK > > ioctls. The absence of support for the HDIO_DRIVE_TASKFILE > > ioctl means that "selective" self-test can't be done. > > I'm not sure if moving smartmontools to the ATA PASS THROUGH > > SCSI commands will win back the "selective" self-test > > capability. Anyway, going to those ATA PASS THROUGH SCSI > > ATA passthru can do anything the legacy IDE ioctls can do (and more). [ definitely ATA passthru is the way to go but... ] discrete taskfiles? multi-PIO? setting transfer speed? and if you are talking about IDE ioctls there is (unfortunately) much more than HDIO_DRIVE_[CMD,TASK,TASKFILE] >From extra things that it can do I see support for LBA48 transfers, is there anything more? Bartlomiej - : 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
