linux-kernel - Re: [PATCH] ACPI driver support for pata

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 23 Feb 2007 12:50:27 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Jeff Garzik <jeff@...zik.org>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI driver support for pata

> Couldn't be do this generically inside libata core somehow, i.e. try to 
> use ACPI to set the proper mode and fall back to the driver-specific 
> mode setting code if that didn't work? I think if we could do that it 

We want to use the native hebaviour first

> would solve a number of problems (i.e. we could prevent it from doing 
> this on SATA controllers which appear to be IDE based on the PCI ID, 
> like the NVIDIA SATA controllers, since the _GTM and _STM methods seem 
> to have undefined behavior on SATA). This would also eliminate the need 

We check this already. A PATA interface without GTM/STM and friends will
not be picked up by pata_acpi but passed on to ata_generic.

> for mkinitrd, people, etc. to know that they're supposed to be loading 
> this other pata_acpi driver instead, since any PATA driver could take 
> advantage of this feature.

The link order is set up so that we try things in a very specific
deliberate order

- Hardware specific driver (unless it deliberately punts to ACPI)
- ACPI driver using _GTM/_STM etc
- Generic PCI driver ("stay in the mode the BIOS set and pray")
- ISA register compatibility mode (PIO)

This is essentially the strategy used by the old IDE layer since way back
when (minus ACPI support) and has served us pretty well.

Alan
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/