linux-kernel - [PATCH v2 2/2] x86/numa: Add Devicetree support

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Date:   Fri, 25 Aug 2023 00:47:37 -0700
From:   Saurabh Sengar <ssengar@...ux.microsoft.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        luto@...nel.org, peterz@...radead.org, mikelley@...rosoft.com,
        linux-kernel@...r.kernel.org
Cc:     ssengar@...ux.microsoft.com
Subject: [PATCH v2 2/2] x86/numa: Add Devicetree support

Hyper-V has usecases where it need to fetch NUMA information from
Devicetree. Currently, it is not possible to extract the NUMA information
from Devicetree for 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@...ux.microsoft.com>
---
 arch/x86/Kconfig   | 1 +
 arch/x86/mm/numa.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 982b777eadc7..16ac287e9628 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -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.
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 2aadb2019b4f..c79f12e449ea 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -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);
-- 
2.34.1