Re: [PATCH v3 1/4] PCI: X-Gene: Add the APM X-Gene v1 PCIe MSI/MSIX termination driver

From: Marc Zyngier
Date: Sat Apr 11 2015 - 08:19:01 EST

Hi Feng,

On 2015-04-11 01:16, Feng Kan wrote:

Is there any plans to support ACPI for GICv2m MSI? Both this driver and the
GICv2m seems to support OF model of discovery for msi controller. X-Gene1
uses this driver and X-Gene2 uses GICv2m, there needs to be a way to
associate msi controller with the PCIe bus. I haven't
found a standard way of doing finding "msi-parent" for ACPI. Do you have
any suggestion.

This is remarkably off topic! ;-)

ACPI only provides information for GICv2m and GICv3. No other interrupt controller,
MSI widget or fairy dust provider will be supported on arm64 with ACPI. So this driver
will be DT only.

GICv2m, being described in the ACPI spec, is growing some support. My understanding is
that this is done by AMD (Suravee Suthikulpanit) using my irq/msi-domain branch as a
base (I know that Suravee is looking at expanding the irqdomain matching code to
accept a pointer to an ACPI table instead of a device node to match the target

Hope this helps,

Fast, cheap, reliable. Pick two.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at