Messages in this thread | | | Subject | Re: [ACPI] Re: RFC: ACPI/scsi/libata integration and hotswap | From | Alan Cox <> | Date | Thu, 08 Dec 2005 14:30:57 +0000 |
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On Iau, 2005-12-08 at 09:14 -0500, Jeff Garzik wrote: > These are only for PATA. We don't care about _GTM/_STM on SATA.
Even your piix driver supports PATA. Put the foaming (justified ;)) hatred for ACPI aside for a moment and take a look at the real world as it unfortunately is right now.
> Further, SATA completely resets and re-initializes the device as if from > a hardware reset (except on ata_piix, which doesn't support COMRESET, > and PATA). This makes _GTF uninteresting, as well.
You don't know what the sequences the resume method is concerned about actually are.
> suspend/resume works just fine with Jens' out-of-tree patch.
Only on some systems.
> > If you don't run the resume methods your disk subsystem status after a > > resume is simply undefined and unsafe. > > I initialize the hardware to a defined state.
Sure, but sometimes the *wrong* defined state. The BIOS ACPI methods include things like unlocking drive passwords on restore with some systems. You don't handle that at all.
Having said that I still think ACPI awareness doesn't belong in libata or scsi because we'd then have awareness of every pm scheme in the wrong layer and a dozen pm systems all with scsi hooks. Gak...
SCSI/libata can go easily from ata channel to pci device to device. The rest of the logic belongs outside of scsi/libata.
Alan
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