Re: [regression][bisected] zx1 AGP GART no more detected since merge of 'acpi-scan' branch

["Rafael J. Wysocki" <rafael.j.wysocki@intel.com>]

Hi,

On 5/21/2014 5:31 PM, Émeric MASCHINO wrote:
> Again,
>
> I'm now quite confident that the regression comes from commit
> 66345d5f79fcfa0214f5d98763643d4ee8e6965d as the description talks
> about an ordering issue on hp rx2600 between the SBA I/O MMU driver
> and the container scan handler.
>
> First, I'm running on hp zx6000 that's a rx2600 with an AGP slot.
> Then, defining DEBUG_SBA_INIT in sba_iommu.c clearly shows in dmesg
> logs that, for working kernel 3.10.40, ioc_init (and thus
> ioc_iova_init) is called once the ACPI/PCI resources (is this the
> right terminology?) have been parsed, whereas for non-working kernel
> 3.11-rc1, ioc_init is called at the very beginning.

Quite evidently, acpi_sba_ioc_add() has to be executed after 
acpi_pci_root_add()
and we need to enforce that ordering somehow.

Please create a bug entry for that at bugzilla.kernel.org (against 
ACPI), mark it as a regression and
assign it to rjw@rjwysocki.net.

Thanks,
Rafael