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authorDimitri Sivanich <sivanich@sgi.com>2010-11-16 16:23:52 -0600
committerIngo Molnar <mingo@elte.hu>2010-11-18 10:41:25 +0100
commit8191c9f69202d4dbc66063cb92059b8a58640d34 (patch)
tree97efeba3b3224390bfac251ecb9e4a037c544453 /arch/x86/include/asm/uv
parent9223081f54e3dc5045fe41a475165d9003c9a779 (diff)
x86: UV: Address interrupt/IO port operation conflict
This patch for SGI UV systems addresses a problem whereby interrupt transactions being looped back from a local IOH, through the hub to a local CPU can (erroneously) conflict with IO port operations and other transactions. To workaound this we set a high bit in the APIC IDs used for interrupts. This bit appears to be ignored by the sockets, but it avoids the conflict in the hub. Signed-off-by: Dimitri Sivanich <sivanich@sgi.com> LKML-Reference: <20101116222352.GA8155@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> ___ arch/x86/include/asm/uv/uv_hub.h | 4 ++++ arch/x86/include/asm/uv/uv_mmrs.h | 19 ++++++++++++++++++- arch/x86/kernel/apic/x2apic_uv_x.c | 25 +++++++++++++++++++++++-- arch/x86/platform/uv/tlb_uv.c | 2 +- arch/x86/platform/uv/uv_time.c | 4 +++- 5 files changed, 49 insertions(+), 5 deletions(-)
Diffstat (limited to 'arch/x86/include/asm/uv')
-rw-r--r--arch/x86/include/asm/uv/uv_hub.h4
-rw-r--r--arch/x86/include/asm/uv/uv_mmrs.h19
2 files changed, 22 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index e969f691cbf..a501741c233 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -199,6 +199,8 @@ union uvh_apicid {
#define UVH_APICID 0x002D0E00L
#define UV_APIC_PNODE_SHIFT 6
+#define UV_APICID_HIBIT_MASK 0xffff0000
+
/* Local Bus from cpu's perspective */
#define LOCAL_BUS_BASE 0x1c00000
#define LOCAL_BUS_SIZE (4 * 1024 * 1024)
@@ -491,8 +493,10 @@ static inline void uv_set_cpu_scir_bits(int cpu, unsigned char value)
}
}
+extern unsigned int uv_apicid_hibits;
static unsigned long uv_hub_ipi_value(int apicid, int vector, int mode)
{
+ apicid |= uv_apicid_hibits;
return (1UL << UVH_IPI_INT_SEND_SHFT) |
((apicid) << UVH_IPI_INT_APIC_ID_SHFT) |
(mode << UVH_IPI_INT_DELIVERY_MODE_SHFT) |
diff --git a/arch/x86/include/asm/uv/uv_mmrs.h b/arch/x86/include/asm/uv/uv_mmrs.h
index 6d90adf4428..20cafeac745 100644
--- a/arch/x86/include/asm/uv/uv_mmrs.h
+++ b/arch/x86/include/asm/uv/uv_mmrs.h
@@ -5,7 +5,7 @@
*
* SGI UV MMR 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_MMRS_H
@@ -754,6 +754,23 @@ union uvh_lb_bau_sb_descriptor_base_u {
};
/* ========================================================================= */
+/* UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK */
+/* ========================================================================= */
+#define UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK 0x320130UL
+#define UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK_32 0x009f0
+
+#define UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK_BIT_ENABLES_SHFT 0
+#define UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK_BIT_ENABLES_MASK 0x00000000ffffffffUL
+
+union uvh_lb_target_physical_apic_id_mask_u {
+ unsigned long v;
+ struct uvh_lb_target_physical_apic_id_mask_s {
+ unsigned long bit_enables : 32; /* RW */
+ unsigned long rsvd_32_63 : 32; /* */
+ } s;
+};
+
+/* ========================================================================= */
/* UVH_NODE_ID */
/* ========================================================================= */
#define UVH_NODE_ID 0x0UL