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Commit c8f730b1 authored by Russ Anderson's avatar Russ Anderson Committed by H. Peter Anvin
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x86, uv: Enable Westmere support on SGI UV 



Enable Westmere support on SGI UV.  The UV initialization code is dependent on
the APICID bits.  Westmere-EX uses different APIC bit mapping than Nehalem-EX.
This code reads the apic shift value from a UV MMR to do the proper bit
decoding to determint the pnode.

Signed-off-by: default avatarRuss Anderson <rja@sgi.com>
LKML-Reference: <20101026212728.GB15071@sgi.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent b365a85c

arch/x86/include/asm/uv/uv_hub.h

+18 −3
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *

 * SGI UV architectural definitions

 *

 * Copyright (C) 2007-2008 Silicon Graphics, Inc. All rights reserved.

 * Copyright (C) 2007-2010 Silicon Graphics, Inc. All rights reserved.

 */



#ifndef _ASM_X86_UV_UV_HUB_H
@@ -77,7 +77,8 @@ 
 *

 *		1111110000000000

 *		5432109876543210

 *		pppppppppplc0cch

 *		pppppppppplc0cch	Nehalem-EX

 *		ppppppppplcc0cch	Westmere-EX

 *		sssssssssss

 *

 *			p  = pnode bits
@@ -148,12 +149,25 @@ struct uv_hub_info_s { 
	unsigned char		m_val;

	unsigned char		n_val;

	struct uv_scir_s	scir;

	unsigned char		apic_pnode_shift;

};



DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);

#define uv_hub_info		(&__get_cpu_var(__uv_hub_info))

#define uv_cpu_hub_info(cpu)	(&per_cpu(__uv_hub_info, cpu))



union uvh_apicid {

    unsigned long       v;

    struct uvh_apicid_s {

        unsigned long   local_apic_mask  : 24;

        unsigned long   local_apic_shift :  5;

        unsigned long   unused1          :  3;

        unsigned long   pnode_mask       : 24;

        unsigned long   pnode_shift      :  5;

        unsigned long   unused2          :  3;

    } s;

};



/*

 * Local & Global MMR space macros.

 *	Note: macros are intended to be used ONLY by inline functions
@@ -182,6 +196,7 @@ DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info); 
#define UV_GLOBAL_MMR64_PNODE_BITS(p)					\

	(((unsigned long)(p)) << UV_GLOBAL_MMR64_PNODE_SHIFT)



#define UVH_APICID		0x002D0E00L

#define UV_APIC_PNODE_SHIFT	6



/* Local Bus from cpu's perspective */
@@ -280,7 +295,7 @@ static inline void *uv_pnode_offset_to_vaddr(int pnode, unsigned long offset) 
 */

static inline int uv_apicid_to_pnode(int apicid)

{

	return (apicid >> UV_APIC_PNODE_SHIFT);

	return (apicid >> uv_hub_info->apic_pnode_shift);

}



/*

arch/x86/kernel/apic/x2apic_uv_x.c

+23 −2
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *

 * SGI UV APIC functions (note: not an Intel compatible APIC)

 *

 * Copyright (C) 2007-2009 Silicon Graphics, Inc. All rights reserved.

 * Copyright (C) 2007-2010 Silicon Graphics, Inc. All rights reserved.

 */

#include <linux/cpumask.h>

#include <linux/hardirq.h>
@@ -41,6 +41,7 @@ DEFINE_PER_CPU(int, x2apic_extra_bits); 


static enum uv_system_type uv_system_type;

static u64 gru_start_paddr, gru_end_paddr;

static union uvh_apicid uvh_apicid;

int uv_min_hub_revision_id;

EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);

static DEFINE_SPINLOCK(uv_nmi_lock);
@@ -70,6 +71,22 @@ static int early_get_nodeid(void) 
	return node_id.s.node_id;

}



static int __init early_get_apic_pnode_shift(void)

{

	unsigned long *mmr;



	mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_APICID, sizeof(*mmr));

	uvh_apicid.v = *mmr;

	early_iounmap(mmr, sizeof(*mmr));

	if (!uvh_apicid.v)

		/*

		 * Old bios, use default value

		 */

		uvh_apicid.s.pnode_shift = UV_APIC_PNODE_SHIFT;



	return uvh_apicid.s.pnode_shift;

}



static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)

{

	int nodeid;
@@ -84,7 +101,7 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 
			uv_system_type = UV_X2APIC;

		else if (!strcmp(oem_table_id, "UVH")) {

			__get_cpu_var(x2apic_extra_bits) =

				nodeid << (UV_APIC_PNODE_SHIFT - 1);

				nodeid << (early_get_apic_pnode_shift() - 1);

			uv_system_type = UV_NON_UNIQUE_APIC;

			return 1;

		}
@@ -716,6 +733,10 @@ void __init uv_system_init(void) 
		int apicid = per_cpu(x86_cpu_to_apicid, cpu);



		nid = cpu_to_node(cpu);

		/*

		 * apic_pnode_shift must be set before calling uv_apicid_to_pnode();

		 */

		uv_cpu_hub_info(cpu)->apic_pnode_shift = uvh_apicid.s.pnode_shift;

		pnode = uv_apicid_to_pnode(apicid);

		blade = boot_pnode_to_blade(pnode);

		lcpu = uv_blade_info[blade].nr_possible_cpus;