Commit acb8bc09 authored by Tejun Heo's avatar Tejun Heo Committed by Ingo Molnar
Browse files

x86: Add apic->x86_32_early_logical_apicid() 



On x86_32, the mapping between cpu and logical apic ID differs
depending on the specific apic implementation in use.  The
mapping is initialized while bringing up CPUs; however, this
makes early inits ignore memory topology.

Add a x86_32 specific apic->x86_32_early_logical_apicid() which
is called early during boot to query the mapping.  The mapping
is later verified against the result of init_apic_ldr().  The
method is allowed to return BAD_APICID if it can't be determined
early.

noop variant which always returns BAD_APICID is implemented and
added to all x86_32 apic implementations.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: eric.dumazet@gmail.com
Cc: yinghai@kernel.org
Cc: brgerst@gmail.com
Cc: gorcunov@gmail.com
Cc: penberg@kernel.org
Cc: shaohui.zheng@intel.com
Cc: rientjes@google.com
LKML-Reference: <1295789862-25482-8-git-send-email-tj@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7632611f

arch/x86/include/asm/apic.h

+19 −0
Original line number Diff line number Diff line
@@ -354,6 +354,20 @@ struct apic { 
	void (*icr_write)(u32 low, u32 high);

	void (*wait_icr_idle)(void);

	u32 (*safe_wait_icr_idle)(void);



#ifdef CONFIG_X86_32

	/*

	 * Called very early during boot from get_smp_config().  It should

	 * return the logical apicid.  x86_[bios]_cpu_to_apicid is

	 * initialized before this function is called.

	 *

	 * If logical apicid can't be determined that early, the function

	 * may return BAD_APICID.  Logical apicid will be configured after

	 * init_apic_ldr() while bringing up CPUs.  Note that NUMA affinity

	 * won't be applied properly during early boot in this case.

	 */

	int (*x86_32_early_logical_apicid)(int cpu);

#endif

};



/*
@@ -501,6 +515,11 @@ extern struct apic apic_noop; 


extern struct apic apic_default;



static inline int noop_x86_32_early_logical_apicid(int cpu)

{

	return BAD_APICID;

}



/*

 * Set up the logical destination ID.

 *

arch/x86/kernel/apic/apic.c

+10 −2
Original line number Diff line number Diff line
@@ -1250,8 +1250,13 @@ void __cpuinit setup_local_APIC(void) 


#ifdef CONFIG_X86_32

	/*

	 * APIC LDR is initialized.  Fetch and store logical_apic_id.

	 * APIC LDR is initialized.  If logical_apicid mapping was

	 * initialized during get_smp_config(), make sure it matches the

	 * actual value.

	 */

	i = early_per_cpu(x86_cpu_to_logical_apicid, cpu);

	WARN_ON(i != BAD_APICID && i != logical_smp_processor_id());

	/* always use the value from LDR */

	early_per_cpu(x86_cpu_to_logical_apicid, cpu) =

		logical_smp_processor_id();

#endif
@@ -1991,7 +1996,10 @@ void __cpuinit generic_processor_info(int apicid, int version) 
	early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;

	early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;

#endif



#ifdef CONFIG_X86_32

	early_per_cpu(x86_cpu_to_logical_apicid, cpu) =

		apic->x86_32_early_logical_apicid(cpu);

#endif

	set_cpu_possible(cpu, true);

	set_cpu_present(cpu, true);

}

arch/x86/kernel/apic/apic_noop.c

+4 −0
Original line number Diff line number Diff line
@@ -191,4 +191,8 @@ struct apic apic_noop = { 
	.icr_write			= noop_apic_icr_write,

	.wait_icr_idle			= noop_apic_wait_icr_idle,

	.safe_wait_icr_idle		= noop_safe_apic_wait_icr_idle,



#ifdef CONFIG_X86_32

	.x86_32_early_logical_apicid	= noop_x86_32_early_logical_apicid,

#endif

};

arch/x86/kernel/apic/bigsmp_32.c

+2 −0
Original line number Diff line number Diff line
@@ -251,4 +251,6 @@ struct apic apic_bigsmp = { 
	.icr_write			= native_apic_icr_write,

	.wait_icr_idle			= native_apic_wait_icr_idle,

	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,



	.x86_32_early_logical_apicid	= noop_x86_32_early_logical_apicid,

};

arch/x86/kernel/apic/es7000_32.c

+4 −0
Original line number Diff line number Diff line
@@ -682,6 +682,8 @@ struct apic __refdata apic_es7000_cluster = { 
	.icr_write			= native_apic_icr_write,

	.wait_icr_idle			= native_apic_wait_icr_idle,

	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,



	.x86_32_early_logical_apicid	= noop_x86_32_early_logical_apicid,

};



struct apic __refdata apic_es7000 = {
@@ -744,4 +746,6 @@ struct apic __refdata apic_es7000 = { 
	.icr_write			= native_apic_icr_write,

	.wait_icr_idle			= native_apic_wait_icr_idle,

	.safe_wait_icr_idle		= native_safe_apic_wait_icr_idle,



	.x86_32_early_logical_apicid	= noop_x86_32_early_logical_apicid,

};

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