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x86/numa: Add Devicetree support

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Hyper-V has usecases where it needs to fetch NUMA information from
Devicetree. Currently, it is not possible to extract the NUMA information
from Devicetree for the x86 arch.

Add support for Devicetree in the x86_numa_init() function, allowing the
retrieval of NUMA node information from the Devicetree.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/1692949657-16446-2-git-send-email-ssengar@linux.microsoft.com
This commit is contained in:
Saurabh Sengar 2023-08-25 00:47:37 -07:00 committed by Ingo Molnar
parent 0d294c8c4e
commit 0c436a5829
2 changed files with 4 additions and 0 deletions
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1
arch/x86/Kconfig
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@ -1534,6 +1534,7 @@ config NUMA
depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
default y if X86_BIGSMP
select USE_PERCPU_NUMA_NODE_ID
select OF_NUMA if OF
help
Enable NUMA (Non-Uniform Memory Access) support.

3
arch/x86/mm/numa.c
View file

@ -3,6 +3,7 @@
#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/of.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/memblock.h>
@ -733,6 +734,8 @@ void __init x86_numa_init(void)
if (!numa_init(amd_numa_init))
return;
#endif
if (acpi_disabled && !numa_init(of_numa_init))
return;
}
numa_init(dummy_numa_init);