brain-hackers_pepepper-mirror/linux-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/linux-brain.git synced 2024-06-09 23:36:23 +09:00
Code Issues Projects Releases Wiki Activity

[PATCH] i386: move apic init in init_IRQs

Browse Source 
All kinds of ugliness exists because we don't initialize
the apics during init_IRQs.
- We calibrate jiffies in non apic mode even when we are using apics.
- We have to have special code to initialize the apics when non-smp.
- The legacy i8259 must exist and be setup correctly, even
  when we won't use it past initialization.
- The kexec on panic code must restore the state of the io_apics.
- init/main.c needs a special case for !smp smp_init on x86

In addition to pure code movement I needed a couple
of non-obvious changes:
- Move setup_boot_APIC_clock into APIC_late_time_init for
  simplicity.
- Use cpu_khz to generate a better approximation of loops_per_jiffies
  so I can verify the timer interrupt is working.
- Call setup_apic_nmi_watchdog again after cpu_khz is initialized on
  the boot cpu.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2005-10-30 14:59:41 -08:00 committed by Linus Torvalds
parent 29b70081f7
commit f2b36db692
10 changed files with 105 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
arch/i386/kernel/apic.c
View File

@ -803,6 +803,7 @@ static int __init detect_init_APIC (void)
void __init init_apic_mappings(void)
{
unsigned int orig_apicid;
unsigned long apic_phys;
/*
@ -824,8 +825,11 @@ void __init init_apic_mappings(void)
* Fetch the APIC ID of the BSP in case we have a
* default configuration (or the MP table is broken).
*/
if (boot_cpu_physical_apicid == -1U)
boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
orig_apicid = boot_cpu_physical_apicid;
boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
if ((orig_apicid != -1U) && (orig_apicid != boot_cpu_physical_apicid))
printk(KERN_WARNING "Boot APIC ID in local APIC unexpected (%d vs %d)",
orig_apicid, boot_cpu_physical_apicid);
#ifdef CONFIG_X86_IO_APIC
{
@ -1046,9 +1050,11 @@ static unsigned int calibration_result;
void __init setup_boot_APIC_clock(void)
{
unsigned long flags;
apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n");
using_apic_timer = 1;
local_irq_save(flags);
local_irq_disable();
calibration_result = calibrate_APIC_clock();
@ -1057,7 +1063,7 @@ void __init setup_boot_APIC_clock(void)
*/
setup_APIC_timer(calibration_result);
local_irq_enable();
local_irq_restore(flags);
}
void __devinit setup_secondary_APIC_clock(void)
@ -1254,40 +1260,81 @@ fastcall void smp_error_interrupt(struct pt_regs *regs)
}
/*
* This initializes the IO-APIC and APIC hardware if this is
* a UP kernel.
* This initializes the IO-APIC and APIC hardware.
*/
int __init APIC_init_uniprocessor (void)
int __init APIC_init(void)
{
if (enable_local_apic < 0)
clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
if (!smp_found_config && !cpu_has_apic)
if (enable_local_apic < 0) {
printk(KERN_INFO "APIC disabled\n");
return -1;
}
/* See if we have a SMP configuration or have forced enabled
* the local apic.
*/
if (!smp_found_config && !acpi_lapic && !cpu_has_apic) {
enable_local_apic = -1;
return -1;
}
/*
* Complain if the BIOS pretends there is one.
* Complain if the BIOS pretends there is an apic.
* Then get out because we don't have an a local apic.
*/
if (!cpu_has_apic && APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
boot_cpu_physical_apicid);
printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
enable_local_apic = -1;
return -1;
}
verify_local_APIC();
/*
* Should not be necessary because the MP table should list the boot
* CPU too, but we do it for the sake of robustness anyway.
* Makes no sense to do this check in clustered apic mode, so skip it
*/
if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
boot_cpu_physical_apicid);
physid_set(hard_smp_processor_id(), phys_cpu_present_map);
}
/*
* Switch from PIC to APIC mode.
*/
connect_bsp_APIC();
phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
setup_local_APIC();
#ifdef CONFIG_X86_IO_APIC
if (smp_found_config)
if (!skip_ioapic_setup && nr_ioapics)
setup_IO_APIC();
/*
* Now start the IO-APICs
*/
if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
setup_IO_APIC();
#endif
setup_boot_APIC_clock();
return 0;
}
void __init APIC_late_time_init(void)
{
/* Improve our loops per jiffy estimate */
loops_per_jiffy = ((1000 + HZ - 1)/HZ)*cpu_khz;
boot_cpu_data.loops_per_jiffy = loops_per_jiffy;
cpu_data[0].loops_per_jiffy = loops_per_jiffy;
/* setup_apic_nmi_watchdog doesn't work properly before cpu_khz is
* initialized. So redo it here to ensure the boot cpu is setup
* properly.
*/
if (nmi_watchdog == NMI_LOCAL_APIC)
setup_apic_nmi_watchdog();
#ifdef CONFIG_X86_IO_APIC
if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
IO_APIC_late_time_init();
#endif
setup_boot_APIC_clock();
}

4
arch/i386/kernel/i8259.c
View File

@ -435,4 +435,8 @@ void __init init_IRQ(void)
setup_irq(FPU_IRQ, &fpu_irq);
irq_ctx_init(smp_processor_id());
#ifdef CONFIG_X86_LOCAL_APIC
APIC_init();
#endif
}

6
arch/i386/kernel/io_apic.c
View File

@ -2387,11 +2387,15 @@ void __init setup_IO_APIC(void)
sync_Arb_IDs();
setup_IO_APIC_irqs();
init_IO_APIC_traps();
check_timer();
if (!acpi_ioapic)
print_IO_APIC();
}
void __init IO_APIC_late_time_init(void)
{
check_timer();
}
/*
* Called after all the initialization is done. If we didnt find any
* APIC bugs then we can allow the modify fast path

68
arch/i386/kernel/smpboot.c
View File

@ -1078,6 +1078,16 @@ void *xquad_portio;
EXPORT_SYMBOL(xquad_portio);
#endif
/*
* Fall back to non SMP mode after errors.
*
*/
static __init void disable_smp(void)
{
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
}
static void __init smp_boot_cpus(unsigned int max_cpus)
{
int apicid, cpu, bit, kicked;
@ -1090,7 +1100,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
printk("CPU%d: ", 0);
print_cpu_info(&cpu_data[0]);
boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
boot_cpu_logical_apicid = logical_smp_processor_id();
x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
@ -1102,68 +1111,27 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
cpus_clear(cpu_core_map[0]);
cpu_set(0, cpu_core_map[0]);
map_cpu_to_logical_apicid();
/*
* If we couldn't find an SMP configuration at boot time,
* get out of here now!
*/
if (!smp_found_config && !acpi_lapic) {
printk(KERN_NOTICE "SMP motherboard not detected.\n");
smpboot_clear_io_apic_irqs();
phys_cpu_present_map = physid_mask_of_physid(0);
if (APIC_init_uniprocessor())
printk(KERN_NOTICE "Local APIC not detected."
" Using dummy APIC emulation.\n");
map_cpu_to_logical_apicid();
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
disable_smp();
return;
}
/*
* Should not be necessary because the MP table should list the boot
* CPU too, but we do it for the sake of robustness anyway.
* Makes no sense to do this check in clustered apic mode, so skip it
*/
if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
boot_cpu_physical_apicid);
physid_set(hard_smp_processor_id(), phys_cpu_present_map);
}
/*
* If we couldn't find a local APIC, then get out of here now!
*/
if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !cpu_has_apic) {
printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
boot_cpu_physical_apicid);
printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
smpboot_clear_io_apic_irqs();
phys_cpu_present_map = physid_mask_of_physid(0);
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
return;
}
verify_local_APIC();
/*
* If SMP should be disabled, then really disable it!
*/
if (!max_cpus) {
smp_found_config = 0;
printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
smpboot_clear_io_apic_irqs();
phys_cpu_present_map = physid_mask_of_physid(0);
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
if (!max_cpus || (enable_local_apic < 0)) {
printk(KERN_INFO "SMP mode deactivated.\n");
disable_smp();
return;
}
connect_bsp_APIC();
setup_local_APIC();
map_cpu_to_logical_apicid();
setup_portio_remap();
/*
@ -1244,10 +1212,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
smpboot_setup_io_apic();
setup_boot_APIC_clock();
/*
* Synchronize the TSC with the AP
*/

12
arch/i386/kernel/time.c
View File

@ -444,8 +444,8 @@ static int time_init_device(void)
device_initcall(time_init_device);
#ifdef CONFIG_HPET_TIMER
extern void (*late_time_init)(void);
#ifdef CONFIG_HPET_TIMER
/* Duplicate of time_init() below, with hpet_enable part added */
static void __init hpet_time_init(void)
{
@ -462,6 +462,11 @@ static void __init hpet_time_init(void)
printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
time_init_hook();
#ifdef CONFIG_X86_LOCAL_APIC
if (enable_local_apic >= 0)
APIC_late_time_init();
#endif
}
#endif
@ -486,4 +491,9 @@ void __init time_init(void)
printk(KERN_INFO "Using %s for high-res timesource\n",cur_timer->name);
time_init_hook();
#ifdef CONFIG_X86_LOCAL_APIC
if (enable_local_apic >= 0)
late_time_init = APIC_late_time_init;
#endif
}

3
include/asm-i386/apic.h
View File

@ -118,7 +118,8 @@ extern void release_lapic_nmi(void);
extern void disable_timer_nmi_watchdog(void);
extern void enable_timer_nmi_watchdog(void);
extern void nmi_watchdog_tick (struct pt_regs * regs);
extern int APIC_init_uniprocessor (void);
extern int APIC_init(void);
extern void APIC_late_time_init(void);
extern void disable_APIC_timer(void);
extern void enable_APIC_timer(void);

1
include/asm-i386/hw_irq.h
View File

@ -55,6 +55,7 @@ void init_8259A(int aeoi);
void FASTCALL(send_IPI_self(int vector));
void init_VISWS_APIC_irqs(void);
void setup_IO_APIC(void);
void IO_APIC_late_time_init(void);
void disable_IO_APIC(void);
void print_IO_APIC(void);
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);

15
include/asm-i386/mach-default/smpboot_hooks.h
View File

@ -1,11 +1,6 @@
/* two abstractions specific to kernel/smpboot.c, mainly to cater to visws
* which needs to alter them. */
static inline void smpboot_clear_io_apic_irqs(void)
{
io_apic_irqs = 0;
}
static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
{
CMOS_WRITE(0xa, 0xf);
@ -32,13 +27,3 @@ static inline void smpboot_restore_warm_reset_vector(void)
*((volatile long *) phys_to_virt(0x467)) = 0;
}
static inline void smpboot_setup_io_apic(void)
{
/*
* Here we can be sure that there is an IO-APIC in the system. Let's
* go and set it up:
*/
if (!skip_ioapic_setup && nr_ioapics)
setup_IO_APIC();
}

7
include/asm-i386/mach-visws/smpboot_hooks.h
View File

@ -11,14 +11,7 @@ static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
/* for visws do nothing for any of these */
static inline void smpboot_clear_io_apic_irqs(void)
{
}
static inline void smpboot_restore_warm_reset_vector(void)
{
}
static inline void smpboot_setup_io_apic(void)
{
}

11
init/main.c
View File

@ -64,10 +64,6 @@
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/smp.h>
#endif
/*
* Versions of gcc older than that listed below may actually compile
* and link okay, but the end product can have subtle run time bugs.
@ -314,14 +310,7 @@ extern void setup_arch(char **);
#ifndef CONFIG_SMP
#ifdef CONFIG_X86_LOCAL_APIC
static void __init smp_init(void)
{
APIC_init_uniprocessor();
}
#else
#define smp_init() do { } while (0)
#endif
static inline void setup_per_cpu_areas(void) { }
static inline void smp_prepare_cpus(unsigned int maxcpus) { }