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authorTejun Heo <tj@kernel.org>2011-01-23 14:37:39 +0100
committerIngo Molnar <mingo@elte.hu>2011-01-28 14:54:09 +0100
commitbbc9e2f452d9c4b166d1f9a78d941d80173312fe (patch)
treed75d41187b296235f833e942ed8c1dd938a7bae4 /arch/x86/include/asm
parent89e5dc218e084e13a3996db6693b01478912f4ee (diff)
x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit
The mapping between cpu/apicid and node is done via apicid_to_node[] on 64bit and apicid_2_node[] + apic->x86_32_numa_cpu_node() on 32bit. This difference makes it difficult to further unify 32 and 64bit NUMA handling. This patch unifies it by replacing both apicid_to_node[] and apicid_2_node[] with __apicid_to_node[] array, which is accessed by two accessors - set_apicid_to_node() and numa_cpu_node(). On 64bit, numa_cpu_node() always consults __apicid_to_node[] directly while 32bit goes through apic->numa_cpu_node() method to allow apic implementations to override it. srat_detect_node() for amd cpus contains workaround for broken NUMA configuration which assumes relationship between APIC ID, HT node ID and NUMA topology. Leave it to access __apicid_to_node[] directly as mapping through CPU might result in undesirable behavior change. The comment is reformatted and updated to note the ugliness. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Pekka Enberg <penberg@kernel.org> Cc: eric.dumazet@gmail.com Cc: yinghai@kernel.org Cc: brgerst@gmail.com Cc: gorcunov@gmail.com Cc: shaohui.zheng@intel.com Cc: rientjes@google.com LKML-Reference: <1295789862-25482-14-git-send-email-tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: David Rientjes <rientjes@google.com>
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r--arch/x86/include/asm/mpspec.h1
-rw-r--r--arch/x86/include/asm/numa.h28
-rw-r--r--arch/x86/include/asm/numa_32.h6
-rw-r--r--arch/x86/include/asm/numa_64.h5
4 files changed, 36 insertions, 4 deletions
diff --git a/arch/x86/include/asm/mpspec.h b/arch/x86/include/asm/mpspec.h
index edc2a455b726..9c7d95f6174b 100644
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -25,7 +25,6 @@ extern int pic_mode;
#define MAX_IRQ_SOURCES 256
extern unsigned int def_to_bigsmp;
-extern u8 apicid_2_node[];
#ifdef CONFIG_X86_NUMAQ
extern int mp_bus_id_to_node[MAX_MP_BUSSES];
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 27da400d3138..5e01c768a575 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -1,5 +1,33 @@
+#ifndef _ASM_X86_NUMA_H
+#define _ASM_X86_NUMA_H
+
+#include <asm/apicdef.h>
+
+#ifdef CONFIG_NUMA
+/*
+ * __apicid_to_node[] stores the raw mapping between physical apicid and
+ * node and is used to initialize cpu_to_node mapping.
+ *
+ * The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
+ * should be accessed by the accessors - set_apicid_to_node() and
+ * numa_cpu_node().
+ */
+extern s16 __apicid_to_node[MAX_LOCAL_APIC];
+
+static inline void set_apicid_to_node(int apicid, s16 node)
+{
+ __apicid_to_node[apicid] = node;
+}
+#else /* CONFIG_NUMA */
+static inline void set_apicid_to_node(int apicid, s16 node)
+{
+}
+#endif /* CONFIG_NUMA */
+
#ifdef CONFIG_X86_32
# include "numa_32.h"
#else
# include "numa_64.h"
#endif
+
+#endif /* _ASM_X86_NUMA_H */
diff --git a/arch/x86/include/asm/numa_32.h b/arch/x86/include/asm/numa_32.h
index b0ef2b449a9d..cdf8043d7a1a 100644
--- a/arch/x86/include/asm/numa_32.h
+++ b/arch/x86/include/asm/numa_32.h
@@ -6,6 +6,12 @@ extern int numa_off;
extern int pxm_to_nid(int pxm);
extern void numa_remove_cpu(int cpu);
+#ifdef CONFIG_NUMA
+extern int __cpuinit numa_cpu_node(int apicid);
+#else /* CONFIG_NUMA */
+static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
+#endif /* CONFIG_NUMA */
+
#ifdef CONFIG_HIGHMEM
extern void set_highmem_pages_init(void);
#else
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 0493be39607c..4982a9c08c2f 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -2,7 +2,6 @@
#define _ASM_X86_NUMA_64_H
#include <linux/nodemask.h>
-#include <asm/apicdef.h>
struct bootnode {
u64 start;
@@ -17,8 +16,6 @@ extern int compute_hash_shift(struct bootnode *nodes, int numblks,
extern void numa_init_array(void);
extern int numa_off;
-extern s16 apicid_to_node[MAX_LOCAL_APIC];
-
extern unsigned long numa_free_all_bootmem(void);
extern void setup_node_bootmem(int nodeid, unsigned long start,
unsigned long end);
@@ -32,6 +29,7 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
#define NODE_MIN_SIZE (4*1024*1024)
extern void __init init_cpu_to_node(void);
+extern int __cpuinit numa_cpu_node(int cpu);
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
extern void __cpuinit numa_add_cpu(int cpu);
@@ -44,6 +42,7 @@ void numa_emu_cmdline(char *);
#endif /* CONFIG_NUMA_EMU */
#else
static inline void init_cpu_to_node(void) { }
+static inline int numa_cpu_node(int cpu) { return NUMA_NO_NODE; }
static inline void numa_set_node(int cpu, int node) { }
static inline void numa_clear_node(int cpu) { }
static inline void numa_add_cpu(int cpu, int node) { }