diff options
| -rw-r--r-- | arch/x86/include/asm/apic.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/x86_init.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 23 | ||||
| -rw-r--r-- | arch/x86/kernel/time.c | 12 | ||||
| -rw-r--r-- | arch/x86/kernel/x86_init.c | 1 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten_pv.c | 1 |
6 files changed, 34 insertions, 7 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 2ebc17d9c72c..be0b9cf941c4 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -140,6 +140,7 @@ extern void apic_soft_disable(void); extern void lapic_shutdown(void); extern void sync_Arb_IDs(void); extern void init_bsp_APIC(void); +extern void apic_intr_mode_select(void); extern void apic_intr_mode_init(void); extern void init_apic_mappings(void); void register_lapic_address(unsigned long address); @@ -188,6 +189,7 @@ static inline void disable_local_APIC(void) { } # define setup_secondary_APIC_clock x86_init_noop static inline void lapic_update_tsc_freq(void) { } static inline void init_bsp_APIC(void) { } +static inline void apic_intr_mode_select(void) { } static inline void apic_intr_mode_init(void) { } static inline void lapic_assign_system_vectors(void) { } static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { } diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h index 19435858df5f..96d9cd208610 100644 --- a/arch/x86/include/asm/x86_init.h +++ b/arch/x86/include/asm/x86_init.h @@ -51,12 +51,14 @@ struct x86_init_resources { * are set up. * @intr_init: interrupt init code * @trap_init: platform specific trap setup + * @intr_mode_select: interrupt delivery mode selection * @intr_mode_init: interrupt delivery mode setup */ struct x86_init_irqs { void (*pre_vector_init)(void); void (*intr_init)(void); void (*trap_init)(void); + void (*intr_mode_select)(void); void (*intr_mode_init)(void); }; diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 28446fa6bf18..4b0f9117e1cd 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -830,8 +830,17 @@ bool __init apic_needs_pit(void) if (!tsc_khz || !cpu_khz) return true; - /* Is there an APIC at all? */ - if (!boot_cpu_has(X86_FEATURE_APIC)) + /* Is there an APIC at all or is it disabled? */ + if (!boot_cpu_has(X86_FEATURE_APIC) || disable_apic) + return true; + + /* + * If interrupt delivery mode is legacy PIC or virtual wire without + * configuration, the local APIC timer wont be set up. Make sure + * that the PIT is initialized. + */ + if (apic_intr_mode == APIC_PIC || + apic_intr_mode == APIC_VIRTUAL_WIRE_NO_CONFIG) return true; /* Virt guests may lack ARAT, but still have DEADLINE */ @@ -1322,7 +1331,7 @@ void __init sync_Arb_IDs(void) enum apic_intr_mode_id apic_intr_mode __ro_after_init; -static int __init apic_intr_mode_select(void) +static int __init __apic_intr_mode_select(void) { /* Check kernel option */ if (disable_apic) { @@ -1384,6 +1393,12 @@ static int __init apic_intr_mode_select(void) return APIC_SYMMETRIC_IO; } +/* Select the interrupt delivery mode for the BSP */ +void __init apic_intr_mode_select(void) +{ + apic_intr_mode = __apic_intr_mode_select(); +} + /* * An initial setup of the virtual wire mode. */ @@ -1440,8 +1455,6 @@ void __init apic_intr_mode_init(void) { bool upmode = IS_ENABLED(CONFIG_UP_LATE_INIT); - apic_intr_mode = apic_intr_mode_select(); - switch (apic_intr_mode) { case APIC_PIC: pr_info("APIC: Keep in PIC mode(8259)\n"); diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c index 7ce29cee9f9e..d8673d8a779b 100644 --- a/arch/x86/kernel/time.c +++ b/arch/x86/kernel/time.c @@ -91,10 +91,18 @@ void __init hpet_time_init(void) static __init void x86_late_time_init(void) { + /* + * Before PIT/HPET init, select the interrupt mode. This is required + * to make the decision whether PIT should be initialized correct. + */ + x86_init.irqs.intr_mode_select(); + + /* Setup the legacy timers */ x86_init.timers.timer_init(); + /* - * After PIT/HPET timers init, select and setup - * the final interrupt mode for delivering IRQs. + * After PIT/HPET timers init, set up the final interrupt mode for + * delivering IRQs. */ x86_init.irqs.intr_mode_init(); tsc_init(); diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c index ce89430a7f80..9a89261dcd2a 100644 --- a/arch/x86/kernel/x86_init.c +++ b/arch/x86/kernel/x86_init.c @@ -80,6 +80,7 @@ struct x86_init_ops x86_init __initdata = { .pre_vector_init = init_ISA_irqs, .intr_init = native_init_IRQ, .trap_init = x86_init_noop, + .intr_mode_select = apic_intr_mode_select, .intr_mode_init = apic_intr_mode_init }, diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index ae4a41ca19f6..1f756ffffe8b 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -1205,6 +1205,7 @@ asmlinkage __visible void __init xen_start_kernel(void) x86_platform.get_nmi_reason = xen_get_nmi_reason; x86_init.resources.memory_setup = xen_memory_setup; + x86_init.irqs.intr_mode_select = x86_init_noop; x86_init.irqs.intr_mode_init = x86_init_noop; x86_init.oem.arch_setup = xen_arch_setup; x86_init.oem.banner = xen_banner; |