Commit bbc9e2f4 authored by Tejun Heo's avatar Tejun Heo Committed by Ingo Molnar
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Reviewed-by: default avatarPekka 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: default avatarIngo Molnar <mingo@elte.hu>
Cc: David Rientjes <rientjes@google.com>
parent 89e5dc21

arch/x86/include/asm/mpspec.h

+0 −1
Original line number Diff line number Diff line
@@ -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];

arch/x86/include/asm/numa.h

+28 −0
Original line number Diff line number Diff line 
#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 */

arch/x86/include/asm/numa_32.h

+6 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/include/asm/numa_64.h

+2 −3
Original line number Diff line number Diff line
@@ -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)	{ }

arch/x86/kernel/acpi/boot.c

+1 −2
Original line number Diff line number Diff line
@@ -589,11 +589,10 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid) 
	nid = acpi_get_node(handle);

	if (nid == -1 || !node_online(nid))

		return;

	set_apicid_to_node(physid, nid);

#ifdef CONFIG_X86_64

	apicid_to_node[physid] = nid;

	numa_set_node(cpu, nid);

#else /* CONFIG_X86_32 */

	apicid_2_node[physid] = nid;

	cpu_to_node_map[cpu] = nid;

#endif

CRA Git | Maintained and supported by SUSTech CRA and CCSE