[tip:x86/uv] x86, uv: Enable Westmere support on SGI UV
From: tip-bot for Russ Anderson
Date: Tue Oct 26 2010 - 19:22:21 EST
Commit-ID: c8f730b1ab825f06733e1c074264f0078721f365
Gitweb: http://git.kernel.org/tip/c8f730b1ab825f06733e1c074264f0078721f365
Author: Russ Anderson <rja@xxxxxxx>
AuthorDate: Tue, 26 Oct 2010 16:27:28 -0500
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Tue, 26 Oct 2010 15:15:28 -0700
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: Russ Anderson <rja@xxxxxxx>
LKML-Reference: <20101026212728.GB15071@xxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/uv/uv_hub.h | 21 ++++++++++++++++++---
arch/x86/kernel/apic/x2apic_uv_x.c | 25 +++++++++++++++++++++++--
2 files changed, 41 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index bf6b88e..e969f69 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -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);
}
/*
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index f744f54..0a2918e 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -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;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/