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Date: Sun, 15 Feb 2009 02:55:32 -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>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: make x2apic config to be config
Impact: make most systems could deselect x2apic
INTR_REMAP is needed to make x2apic working,
but INTR_REMAP is experimental, so just make x2apic depends on
INTR_REMAP in config
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/Kconfig | 5 +++++
arch/x86/include/asm/apic.h | 18 +++++++++++++++---
arch/x86/kernel/Makefile | 4 ++--
arch/x86/kernel/apic.c | 36 +++++++++++++-----------------------
arch/x86/kernel/cpu/common.c | 2 +-
arch/x86/kernel/genapic_64.c | 4 ++++
arch/x86/kernel/setup.c | 3 +--
arch/x86/kernel/smpboot.c | 2 +-
8 files changed, 42 insertions(+), 32 deletions(-)
Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -236,6 +236,10 @@ config SMP
If you don't know what to do here, say N.
+config X2APIC
+ def_bool y
+ depends on INTR_REMAP
+
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on PCI_MSI || HT_IRQ
@@ -1835,6 +1839,7 @@ config DMAR_FLOPPY_WA
config INTR_REMAP
bool "Support for Interrupt Remapping (EXPERIMENTAL)"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
+ select X2APIC
---help---
Supports Interrupt remapping for IO-APIC and MSI devices.
To use x2apic mode in the CPU's which support x2APIC enhancements or
Index: linux-2.6/arch/x86/include/asm/apic.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/apic.h
+++ linux-2.6/arch/x86/include/asm/apic.h
@@ -112,7 +112,7 @@ static inline u32 native_apic_msr_read(u
return low;
}
-#ifndef CONFIG_X86_32
+#ifdef CONFIG_X2APIC
extern int x2apic;
extern void check_x2apic(void);
extern void enable_x2apic(void);
@@ -131,7 +131,19 @@ static inline int x2apic_enabled(void)
return 0;
}
#else
-#define x2apic_enabled() 0
+static inline void check_x2apic(void)
+{
+}
+static inline void enable_x2apic(void)
+{
+}
+static inline void enable_IR_x2apic(void)
+{
+}
+static inline int x2apic_enabled(void)
+{
+ return 0;
+}
#endif
struct apic_ops {
@@ -177,7 +189,7 @@ static inline u32 safe_apic_wait_icr_idl
extern int get_physical_broadcast(void);
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X2APIC
static inline void ack_x2APIC_irq(void)
{
/* Docs say use 0 for future compatibility */
Index: linux-2.6/arch/x86/kernel/Makefile
===================================================================
--- linux-2.6.orig/arch/x86/kernel/Makefile
+++ linux-2.6/arch/x86/kernel/Makefile
@@ -117,8 +117,8 @@ obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
obj-y += genapic_64.o genapic_flat_64.o
- obj-y += genx2apic_cluster.o
- obj-y += genx2apic_phys.o
+ obj-$(CONFIG_X2APIC) += genx2apic_cluster.o
+ obj-$(CONFIG_X2APIC) += genx2apic_phys.o
obj-$(CONFIG_X86_UV) += genx2apic_uv_x.o tlb_uv.o
obj-$(CONFIG_X86_UV) += bios_uv.o uv_irq.o uv_sysfs.o
obj-$(CONFIG_X86_PM_TIMER) += pmtimer_64.o
Index: linux-2.6/arch/x86/kernel/apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic.c
+++ linux-2.6/arch/x86/kernel/apic.c
@@ -113,11 +113,7 @@ static __init int setup_apicpmtimer(char
__setup("apicpmtimer", setup_apicpmtimer);
#endif
-#ifdef CONFIG_X86_64
-#define HAVE_X2APIC
-#endif
-
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
int x2apic;
/* x2apic enabled before OS handover */
static int x2apic_preenabled;
@@ -270,7 +266,7 @@ static struct apic_ops xapic_ops = {
struct apic_ops __read_mostly *apic_ops = &xapic_ops;
EXPORT_SYMBOL_GPL(apic_ops);
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
static void x2apic_wait_icr_idle(void)
{
/* no need to wait for icr idle in x2apic */
@@ -1324,11 +1320,14 @@ void __cpuinit end_local_APIC_setup(void
apic_pm_activate();
}
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
void check_x2apic(void)
{
int msr, msr2;
+ if (!cpu_has_x2apic)
+ return;
+
rdmsr(MSR_IA32_APICBASE, msr, msr2);
if (msr & X2APIC_ENABLE) {
@@ -1342,6 +1341,9 @@ void enable_x2apic(void)
{
int msr, msr2;
+ if (!x2apic)
+ return;
+
rdmsr(MSR_IA32_APICBASE, msr, msr2);
if (!(msr & X2APIC_ENABLE)) {
pr_info("Enabling x2apic\n");
@@ -1429,21 +1431,9 @@ end:
pr_info("Enabled Interrupt-remapping\n");
} else
pr_err("Failed to enable Interrupt-remapping and x2apic\n");
-#else
- if (!cpu_has_x2apic)
- return;
-
- if (x2apic_preenabled)
- panic("x2apic enabled prior OS handover,"
- " enable CONFIG_INTR_REMAP");
-
- pr_info("Enable CONFIG_INTR_REMAP for enabling intr-remapping "
- " and x2apic\n");
#endif
-
- return;
}
-#endif /* HAVE_X2APIC */
+#endif /* CONFIG_X2APIC */
#ifdef CONFIG_X86_64
/*
@@ -1574,7 +1564,7 @@ void __init early_init_lapic_mapping(voi
*/
void __init init_apic_mappings(void)
{
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
if (x2apic) {
boot_cpu_physical_apicid = read_apic_id();
return;
@@ -1638,7 +1628,7 @@ int __init APIC_init_uniprocessor(void)
}
#endif
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
enable_IR_x2apic();
#endif
#ifdef CONFIG_X86_64
@@ -2029,7 +2019,7 @@ static int lapic_resume(struct sys_devic
local_irq_save(flags);
-#ifdef HAVE_X2APIC
+#ifdef CONFIG_X2APIC
if (x2apic)
enable_x2apic();
else
Index: linux-2.6/arch/x86/kernel/cpu/common.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/common.c
+++ linux-2.6/arch/x86/kernel/cpu/common.c
@@ -1060,7 +1060,7 @@ void __cpuinit cpu_init(void)
barrier();
check_efer();
- if (cpu != 0 && x2apic)
+ if (cpu != 0)
enable_x2apic();
/*
Index: linux-2.6/arch/x86/kernel/genapic_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/genapic_64.c
+++ linux-2.6/arch/x86/kernel/genapic_64.c
@@ -35,8 +35,10 @@ static struct genapic *apic_probe[] __in
#ifdef CONFIG_X86_UV
&apic_x2apic_uv_x,
#endif
+#ifdef CONFIG_X2APIC
&apic_x2apic_phys,
&apic_x2apic_cluster,
+#endif
&apic_physflat,
NULL,
};
@@ -46,10 +48,12 @@ static struct genapic *apic_probe[] __in
*/
void __init default_setup_apic_routing(void)
{
+#ifdef CONFIG_X2APIC
if (apic == &apic_x2apic_phys || apic == &apic_x2apic_cluster) {
if (!intr_remapping_enabled)
apic = &apic_flat;
}
+#endif
if (apic == &apic_flat) {
if (max_physical_apicid >= 8)
Index: linux-2.6/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup.c
+++ linux-2.6/arch/x86/kernel/setup.c
@@ -836,8 +836,7 @@ void __init setup_arch(char **cmdline_p)
#else
num_physpages = max_pfn;
- if (cpu_has_x2apic)
- check_x2apic();
+ check_x2apic();
/* How many end-of-memory variables you have, grandma! */
/* need this before calling reserve_initrd */
Index: linux-2.6/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6/arch/x86/kernel/smpboot.c
@@ -1128,8 +1128,8 @@ void __init native_smp_prepare_cpus(unsi
current_thread_info()->cpu = 0; /* needed? */
set_cpu_sibling_map(0);
-#ifdef CONFIG_X86_64
enable_IR_x2apic();
+#ifdef CONFIG_X86_64
default_setup_apic_routing();
#endif
--
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