[PATCH v6 16/17] xen/arm: Provide Kconfig options for Arm to enable NUMA

[Henry Wang <Henry.Wang@xxxxxxx>]

From: Wei Chen <wei.chen@xxxxxxx>

Arm platforms support both ACPI and device tree. We don't
want users to select device tree NUMA or ACPI NUMA manually.
We hope users can just enable NUMA for Arm, and device tree
NUMA and ACPI NUMA can be selected depends on device tree
feature and ACPI feature status automatically. In this case,
these two kinds of NUMA support code can be co-exist in one
Xen binary. Xen can check feature flags to decide using
device tree or ACPI as NUMA based firmware.

So in this patch, we introduce a generic option:
CONFIG_ARM_NUMA for users to enable NUMA for Arm.
And one CONFIG_DEVICE_TREE_NUMA option for ARM_NUMA
to select when HAS_DEVICE_TREE option is enabled.
Once when ACPI NUMA for Arm is supported, ACPI_NUMA
can be selected here too.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
---
v5 -> v6:
- Rebase on top of staging without code changes.
v1 -> v5:
- Remove the condition of selecting DEVICE_TREE_NUMA.
---
 xen/arch/arm/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 2939db429b..5ce6b20cf2 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -80,6 +80,17 @@ config ARM_EFI
          UEFI firmware. A UEFI stub is provided to allow Xen to
          be booted as an EFI application.
 
+config ARM_NUMA
+       bool "Arm NUMA (Non-Uniform Memory Access) Support (UNSUPPORTED)" if 
UNSUPPORTED
+       depends on HAS_DEVICE_TREE
+       select DEVICE_TREE_NUMA
+       help
+         Enable Non-Uniform Memory Access (NUMA) for Arm architecutres
+
+config DEVICE_TREE_NUMA
+       bool
+       select NUMA
+
 config GICV3
        bool "GICv3 driver"
        depends on !NEW_VGIC
-- 
2.25.1