diff options
Diffstat (limited to 'arch/x86/kernel/io_apic.c')
| -rw-r--r-- | arch/x86/kernel/io_apic.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c index e5be9f35ea5..855209a1b17 100644 --- a/arch/x86/kernel/io_apic.c +++ b/arch/x86/kernel/io_apic.c @@ -1657,7 +1657,7 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin, * to the first CPU. */ entry.dest_mode = apic->irq_dest_mode; - entry.mask = 1; /* mask IRQ now */ + entry.mask = 0; /* don't mask IRQ for edge */ entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus()); entry.delivery_mode = apic->irq_delivery_mode; entry.polarity = 0; @@ -2863,14 +2863,10 @@ static inline void __init check_timer(void) int cpu = boot_cpu_id; int apic1, pin1, apic2, pin2; unsigned long flags; - unsigned int ver; int no_pin1 = 0; local_irq_save(flags); - ver = apic_read(APIC_LVR); - ver = GET_APIC_VERSION(ver); - /* * get/set the timer IRQ vector: */ @@ -2889,7 +2885,13 @@ static inline void __init check_timer(void) apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT); init_8259A(1); #ifdef CONFIG_X86_32 - timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver)); + { + unsigned int ver; + + ver = apic_read(APIC_LVR); + ver = GET_APIC_VERSION(ver); + timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver)); + } #endif pin1 = find_isa_irq_pin(0, mp_INT); @@ -2928,8 +2930,17 @@ static inline void __init check_timer(void) if (no_pin1) { add_pin_to_irq_cpu(cfg, cpu, apic1, pin1); setup_timer_IRQ0_pin(apic1, pin1, cfg->vector); + } else { + /* for edge trigger, setup_IO_APIC_irq already + * leave it unmasked. + * so only need to unmask if it is level-trigger + * do we really have level trigger timer? + */ + int idx; + idx = find_irq_entry(apic1, pin1, mp_INT); + if (idx != -1 && irq_trigger(idx)) + unmask_IO_APIC_irq_desc(desc); } - unmask_IO_APIC_irq_desc(desc); if (timer_irq_works()) { if (nmi_watchdog == NMI_IO_APIC) { setup_nmi(); @@ -2943,6 +2954,7 @@ static inline void __init check_timer(void) if (intr_remapping_enabled) panic("timer doesn't work through Interrupt-remapped IO-APIC"); #endif + local_irq_disable(); clear_IO_APIC_pin(apic1, pin1); if (!no_pin1) apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: " @@ -2957,7 +2969,6 @@ static inline void __init check_timer(void) */ replace_pin_at_irq_cpu(cfg, cpu, apic1, pin1, apic2, pin2); setup_timer_IRQ0_pin(apic2, pin2, cfg->vector); - unmask_IO_APIC_irq_desc(desc); enable_8259A_irq(0); if (timer_irq_works()) { apic_printk(APIC_QUIET, KERN_INFO "....... works.\n"); @@ -2972,6 +2983,7 @@ static inline void __init check_timer(void) /* * Cleanup, just in case ... */ + local_irq_disable(); disable_8259A_irq(0); clear_IO_APIC_pin(apic2, pin2); apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n"); @@ -2997,6 +3009,7 @@ static inline void __init check_timer(void) apic_printk(APIC_QUIET, KERN_INFO "..... works.\n"); goto out; } + local_irq_disable(); disable_8259A_irq(0); apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector); apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n"); @@ -3014,6 +3027,7 @@ static inline void __init check_timer(void) apic_printk(APIC_QUIET, KERN_INFO "..... works.\n"); goto out; } + local_irq_disable(); apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n"); panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a " "report. Then try booting with the 'noapic' option.\n"); |