linux-kernel - [PATCH 1/7] arch_numa: Provide platform numa init hook

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Message-Id: <20240809-mips-numa-v1-1-568751803bf8@flygoat.com>
Date: Fri, 09 Aug 2024 20:25:01 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Huacai Chen <chenhuacai@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, 
 linux-mips@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 1/7] arch_numa: Provide platform numa init hook

For some pre-devicetree systems, NUMA information may come from
platform specific way.

Provide platform numa init hook to allow platform code kick in
as last resort method to supply NUMA configuration.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 drivers/base/arch_numa.c   | 7 +++++++
 include/asm-generic/numa.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
index 8d49893c0e94..d464baeee69a 100644
--- a/drivers/base/arch_numa.c
+++ b/drivers/base/arch_numa.c
@@ -305,6 +305,11 @@ static int __init arch_acpi_numa_init(void)
 }
 #endif

+int __init __weak arch_platform_numa_init(void)
+{
+	return -EOPNOTSUPP;
+}
+
 /**
  * arch_numa_init() - Initialize NUMA
  *
@@ -318,6 +323,8 @@ void __init arch_numa_init(void)
 			return;
 		if (acpi_disabled && !numa_init(of_numa_init))
 			return;
+		if (!numa_init(arch_platform_numa_init))
+			return;
 	}

 	numa_init(dummy_numa_init);
diff --git a/include/asm-generic/numa.h b/include/asm-generic/numa.h
index c2b046d1fd82..53a8210fde00 100644
--- a/include/asm-generic/numa.h
+++ b/include/asm-generic/numa.h
@@ -31,6 +31,7 @@ static inline const struct cpumask *cpumask_of_node(int node)
 #endif

 void __init arch_numa_init(void);
+int __init arch_platform_numa_init(void);
 int __init numa_add_memblk(int nodeid, u64 start, u64 end);
 void __init early_map_cpu_to_node(unsigned int cpu, int nid);
 int __init early_cpu_to_node(int cpu);

-- 
2.46.0