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x64, x2apic/intr-remap: add x2apic support, including enabling interrupt-remapping

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x2apic support.  Interrupt-remapping must be enabled before enabling x2apic,
this is needed to ensure that IO interrupts continue to work properly after the
cpu mode is changed to x2apic(which uses 32bit extended physical/cluster
apic id).

On systems where apicid's are > 255, BIOS can handover the control to OS in
x2apic mode. Or if the OS handover was in legacy xapic mode, check
if it is capable of x2apic mode. And if we succeed in enabling
Interrupt-remapping, then we can enable x2apic mode in the CPU.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha 2008-07-10 11:16:58 -07:00 committed by Ingo Molnar
parent 75c46fa61b
commit 6e1cb38a2a
9 changed files with 171 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/kernel-parameters.txt
View File

@ -1377,6 +1377,8 @@ and is between 256 and 4096 characters. It is defined in the file
nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
nox2apic [X86-64,APIC] Do not enable x2APIC mode.
noltlbs [PPC] Do not use large page/tlb entries for kernel
lowmem mapping on PPC40x.

2
arch/x86/kernel/acpi/boot.c
View File

@ -1337,7 +1337,9 @@ static void __init acpi_process_madt(void)
acpi_ioapic = 1;
smp_found_config = 1;
#ifdef CONFIG_X86_32
setup_apic_routing();
#endif
}
}
if (error == -EINVAL) {

154
arch/x86/kernel/apic_64.c
View File

@ -27,6 +27,7 @@
#include <linux/clockchips.h>
#include <linux/acpi_pmtmr.h>
#include <linux/module.h>
#include <linux/dmar.h>
#include <asm/atomic.h>
#include <asm/smp.h>
@ -39,6 +40,7 @@
#include <asm/proto.h>
#include <asm/timex.h>
#include <asm/apic.h>
#include <asm/i8259.h>
#include <mach_ipi.h>
#include <mach_apic.h>
@ -46,8 +48,12 @@
static int disable_apic_timer __cpuinitdata;
static int apic_calibrate_pmtmr __initdata;
int disable_apic;
int disable_x2apic;
int x2apic;
/* x2apic enabled before OS handover */
int x2apic_preenabled;
/* Local APIC timer works in C2 */
int local_apic_timer_c2_ok;
EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
@ -896,6 +902,125 @@ void __cpuinit end_local_APIC_setup(void)
apic_pm_activate();
}
void check_x2apic(void)
{
int msr, msr2;
rdmsr(MSR_IA32_APICBASE, msr, msr2);
if (msr & X2APIC_ENABLE) {
printk("x2apic enabled by BIOS, switching to x2apic ops\n");
x2apic_preenabled = x2apic = 1;
apic_ops = &x2apic_ops;
}
}
void enable_x2apic(void)
{
int msr, msr2;
rdmsr(MSR_IA32_APICBASE, msr, msr2);
if (!(msr & X2APIC_ENABLE)) {
printk("Enabling x2apic\n");
wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0);
}
}
void enable_IR_x2apic(void)
{
#ifdef CONFIG_INTR_REMAP
int ret;
unsigned long flags;
if (!cpu_has_x2apic)
return;
if (!x2apic_preenabled && disable_x2apic) {
printk(KERN_INFO
"Skipped enabling x2apic and Interrupt-remapping "
"because of nox2apic\n");
return;
}
if (x2apic_preenabled && disable_x2apic)
panic("Bios already enabled x2apic, can't enforce nox2apic");
if (!x2apic_preenabled && skip_ioapic_setup) {
printk(KERN_INFO
"Skipped enabling x2apic and Interrupt-remapping "
"because of skipping io-apic setup\n");
return;
}
ret = dmar_table_init();
if (ret) {
printk(KERN_INFO
"dmar_table_init() failed with %d:\n", ret);
if (x2apic_preenabled)
panic("x2apic enabled by bios. But IR enabling failed");
else
printk(KERN_INFO
"Not enabling x2apic,Intr-remapping\n");
return;
}
local_irq_save(flags);
mask_8259A();
save_mask_IO_APIC_setup();
ret = enable_intr_remapping(1);
if (ret && x2apic_preenabled) {
local_irq_restore(flags);
panic("x2apic enabled by bios. But IR enabling failed");
}
if (ret)
goto end;
if (!x2apic) {
x2apic = 1;
apic_ops = &x2apic_ops;
enable_x2apic();
}
end:
if (ret)
/*
* IR enabling failed
*/
restore_IO_APIC_setup();
else
reinit_intr_remapped_IO_APIC(x2apic_preenabled);
unmask_8259A();
local_irq_restore(flags);
if (!ret) {
if (!x2apic_preenabled)
printk(KERN_INFO
"Enabled x2apic and interrupt-remapping\n");
else
printk(KERN_INFO
"Enabled Interrupt-remapping\n");
} else
printk(KERN_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");
printk(KERN_INFO "Enable CONFIG_INTR_REMAP for enabling intr-remapping "
" and x2apic\n");
#endif
return;
}
/*
* Detect and enable local APICs on non-SMP boards.
* Original code written by Keir Fraser.
@ -943,6 +1068,11 @@ void __init early_init_lapic_mapping(void)
*/
void __init init_apic_mappings(void)
{
if (x2apic) {
boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
return;
}
/*
* If no local APIC can be found then set up a fake all
* zeroes page to simulate the local APIC and another
@ -981,6 +1111,9 @@ int __init APIC_init_uniprocessor(void)
return -1;
}
enable_IR_x2apic();
setup_apic_routing();
verify_local_APIC();
connect_bsp_APIC();
@ -1238,10 +1371,14 @@ static int lapic_resume(struct sys_device *dev)
maxlvt = lapic_get_maxlvt();
local_irq_save(flags);
rdmsr(MSR_IA32_APICBASE, l, h);
l &= ~MSR_IA32_APICBASE_BASE;
l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
wrmsr(MSR_IA32_APICBASE, l, h);
if (!x2apic) {
rdmsr(MSR_IA32_APICBASE, l, h);
l &= ~MSR_IA32_APICBASE_BASE;
l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
wrmsr(MSR_IA32_APICBASE, l, h);
} else
enable_x2apic();
apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
apic_write(APIC_ID, apic_pm_state.apic_id);
apic_write(APIC_DFR, apic_pm_state.apic_dfr);
@ -1381,6 +1518,15 @@ __cpuinit int apic_is_clustered_box(void)
return (clusters > 2);
}
static __init int setup_nox2apic(char *str)
{
disable_x2apic = 1;
clear_cpu_cap(&boot_cpu_data, X86_FEATURE_X2APIC);
return 0;
}
early_param("nox2apic", setup_nox2apic);
/*
* APIC command line parameters
*/

2
arch/x86/kernel/cpu/common_64.c
View File

@ -606,6 +606,8 @@ void __cpuinit cpu_init(void)
barrier();
check_efer();
if (cpu != 0 && x2apic)
enable_x2apic();
/*
* set up and load the per-CPU TSS

1
arch/x86/kernel/genapic_64.c
View File

@ -16,6 +16,7 @@
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/hardirq.h>
#include <linux/dmar.h>
#include <asm/smp.h>
#include <asm/ipi.h>

2
arch/x86/kernel/mpparse.c
View File

@ -545,7 +545,9 @@ static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
generic_bigsmp_probe();
#endif
#ifdef CONFIG_X86_32
setup_apic_routing();
#endif
if (!num_processors)
printk(KERN_ERR "MPTABLE: no processors registered!\n");
return num_processors;

2
arch/x86/kernel/setup.c
View File

@ -730,6 +730,8 @@ void __init setup_arch(char **cmdline_p)
num_physpages = max_pfn;
check_efer();
if (cpu_has_x2apic)
check_x2apic();
/* How many end-of-memory variables you have, grandma! */
/* need this before calling reserve_initrd */

5
arch/x86/kernel/smpboot.c
View File

@ -1145,6 +1145,11 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
current_thread_info()->cpu = 0; /* needed? */
set_cpu_sibling_map(0);
#ifdef CONFIG_X86_64
enable_IR_x2apic();
setup_apic_routing();
#endif
if (smp_sanity_check(max_cpus) < 0) {
printk(KERN_INFO "SMP disabled\n");
disable_smp();

5
include/asm-x86/apic.h
View File

@ -100,6 +100,11 @@ extern void apic_wait_icr_idle(void);
extern u32 safe_apic_wait_icr_idle(void);
extern void apic_icr_write(u32 low, u32 id);
#else
extern int x2apic, x2apic_preenabled;
extern void check_x2apic(void);
extern void enable_x2apic(void);
extern void enable_IR_x2apic(void);
extern void x2apic_icr_write(u32 low, u32 id);
struct apic_ops {
u32 (*read)(u32 reg);