From ec0f8d3fbb7ea12cfd10083e340381b96e7c34f8 Mon Sep 17 00:00:00 2001
From: Huacai Chen <chenhc@lemote.com>
Date: Tue, 4 Nov 2014 14:13:26 +0800
Subject: MIPS: Loongson: Allow booting from any core
By offering Logical->Physical core id mapping, so as to reserve some
physical cores via mask. This allow booting from any core when core-0
has problems. Since the maximun cores supported by Loongson-3 is 16,
32-bit cpu_startup_core_id can be split to 16-bit cpu_startup_core_id
and 16-bit reserved_cores_mask for compatibility.
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/8323/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/loongson/loongson-3/numa.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
(limited to 'arch/mips/loongson/loongson-3/numa.c')
diff --git a/arch/mips/loongson/loongson-3/numa.c b/arch/mips/loongson/loongson-3/numa.c
index 42323bcc5d28..6cae0e75de27 100644
--- a/arch/mips/loongson/loongson-3/numa.c
+++ b/arch/mips/loongson/loongson-3/numa.c
@@ -224,7 +224,7 @@ static void __init node_mem_init(unsigned int node)
static __init void prom_meminit(void)
{
- unsigned int node, cpu;
+ unsigned int node, cpu, active_cpu = 0;
cpu_node_probe();
init_topology_matrix();
@@ -240,8 +240,14 @@ static __init void prom_meminit(void)
node = cpu / loongson_sysconf.cores_per_node;
if (node >= num_online_nodes())
node = 0;
- pr_info("NUMA: set cpumask cpu %d on node %d\n", cpu, node);
- cpu_set(cpu, __node_data[(node)]->cpumask);
+
+ if (loongson_sysconf.reserved_cpus_mask & (1<<cpu))
+ continue;
+
+ cpu_set(active_cpu, __node_data[(node)]->cpumask);
+ pr_info("NUMA: set cpumask cpu %d on node %d\n", active_cpu, node);
+
+ active_cpu++;
}
}
--
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