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Date: Thu, 19 Feb 2009 13:50:07 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Suresh Siddha <suresh.b.siddha@...el.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: enable x2apic early at the first point
Impact: fix bug.
otherwise will get panic from early_acpi_boot_init()
also make disable_x2apic global, so could use it it x2_apic_xxx.c
and can get warning if preenabled system using nox2apic.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/kernel/apic/apic.c | 3 +--
arch/x86/kernel/apic/x2apic_cluster.c | 5 ++++-
arch/x86/kernel/apic/x2apic_phys.c | 5 ++++-
arch/x86/kernel/apic/x2apic_uv_x.c | 4 +++-
drivers/pci/dmar.c | 3 ++-
5 files changed, 14 insertions(+), 6 deletions(-)
Index: linux-2.6/arch/x86/kernel/apic/x2apic_cluster.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/x2apic_cluster.c
+++ linux-2.6/arch/x86/kernel/apic/x2apic_cluster.c
@@ -14,8 +14,11 @@ DEFINE_PER_CPU(u32, x86_cpu_to_logical_a
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
- if (cpu_has_x2apic)
+ if (cpu_has_x2apic && !disable_x2apic) {
+ x2apic = 1;
+ enable_x2apic();
return 1;
+ }
return 0;
}
Index: linux-2.6/arch/x86/kernel/apic/x2apic_phys.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/x2apic_phys.c
+++ linux-2.6/arch/x86/kernel/apic/x2apic_phys.c
@@ -21,8 +21,11 @@ early_param("x2apic_phys", set_x2apic_ph
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
- if (cpu_has_x2apic && x2apic_phys)
+ if (cpu_has_x2apic && !disable_x2apic && x2apic_phys) {
+ x2apic = 1;
+ enable_x2apic();
return 1;
+ }
return 0;
}
Index: linux-2.6/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux-2.6/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -41,8 +41,10 @@ static int uv_acpi_madt_oem_check(char *
uv_system_type = UV_LEGACY_APIC;
else if (!strcmp(oem_table_id, "UVX"))
uv_system_type = UV_X2APIC;
- else if (!strcmp(oem_table_id, "UVH")) {
+ else if (!strcmp(oem_table_id, "UVH") && !disable_x2apic) {
uv_system_type = UV_NON_UNIQUE_APIC;
+ x2apic = 1;
+ enable_x2apic();
return 1;
}
}
Index: linux-2.6/arch/x86/kernel/apic/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6/arch/x86/kernel/apic/apic.c
@@ -116,11 +116,10 @@ __setup("apicpmtimer", setup_apicpmtimer
int x2apic;
/* x2apic enabled before OS handover */
static int x2apic_preenabled;
-static int disable_x2apic;
+int disable_x2apic;
static __init int setup_nox2apic(char *str)
{
disable_x2apic = 1;
- setup_clear_cpu_cap(X86_FEATURE_X2APIC);
return 0;
}
early_param("nox2apic", setup_nox2apic);
Index: linux-2.6/drivers/pci/dmar.c
===================================================================
--- linux-2.6.orig/drivers/pci/dmar.c
+++ linux-2.6/drivers/pci/dmar.c
@@ -472,7 +472,8 @@ void __init detect_intel_iommu(void)
* is added, we will not need this any more.
*/
dmar = (struct acpi_table_dmar *) dmar_tbl;
- if (ret && cpu_has_x2apic && dmar->flags & 0x1)
+ if (ret && cpu_has_x2apic && !disable_x2apic &&
+ dmar->flags & 0x1)
printk(KERN_INFO
"Queued invalidation will be enabled to support "
"x2apic and Intr-remapping.\n");
--
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