diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:31:49 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-02 16:31:49 -0700 |
commit | 96a3d998fb92c28b9862297fcf93a24d8a0eac1d (patch) | |
tree | 7fe1a799a3a84d276e7dcf8b0afa5b4ceb56659f /arch/x86/kernel | |
parent | 3045f94a20cc54e3e5b20a843701eeab86f57163 (diff) | |
parent | 5236eb968ec21c693d463d0494e39b00c1bc174d (diff) | |
download | linux-next-96a3d998fb92c28b9862297fcf93a24d8a0eac1d.tar.gz |
Merge branch 'x86-tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 tracing updates from Ingo Molnar:
"This tree adds IRQ vector tracepoints that are named after the handler
and which output the vector #, based on a zero-overhead approach that
relies on changing the IDT entries, by Seiji Aguchi.
The new tracepoints look like this:
# perf list | grep -i irq_vector
irq_vectors:local_timer_entry [Tracepoint event]
irq_vectors:local_timer_exit [Tracepoint event]
irq_vectors:reschedule_entry [Tracepoint event]
irq_vectors:reschedule_exit [Tracepoint event]
irq_vectors:spurious_apic_entry [Tracepoint event]
irq_vectors:spurious_apic_exit [Tracepoint event]
irq_vectors:error_apic_entry [Tracepoint event]
irq_vectors:error_apic_exit [Tracepoint event]
[...]"
* 'x86-tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tracing: Add config option checking to the definitions of mce handlers
trace,x86: Do not call local_irq_save() in load_current_idt()
trace,x86: Move creation of irq tracepoints from apic.c to irq.c
x86, trace: Add irq vector tracepoints
x86: Rename variables for debugging
x86, trace: Introduce entering/exiting_irq()
tracing: Add DEFINE_EVENT_FN() macro
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r-- | arch/x86/kernel/Makefile | 3 | ||||
-rw-r--r-- | arch/x86/kernel/apic/apic.c | 69 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/common.c | 20 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/mcheck/therm_throt.c | 24 | ||||
-rw-r--r-- | arch/x86/kernel/cpu/mcheck/threshold.c | 24 | ||||
-rw-r--r-- | arch/x86/kernel/entry_32.S | 12 | ||||
-rw-r--r-- | arch/x86/kernel/entry_64.S | 36 | ||||
-rw-r--r-- | arch/x86/kernel/head_64.S | 8 | ||||
-rw-r--r-- | arch/x86/kernel/irq.c | 33 | ||||
-rw-r--r-- | arch/x86/kernel/irq_work.c | 24 | ||||
-rw-r--r-- | arch/x86/kernel/smp.c | 65 | ||||
-rw-r--r-- | arch/x86/kernel/tracepoint.c | 61 | ||||
-rw-r--r-- | arch/x86/kernel/traps.c | 2 |
13 files changed, 317 insertions, 64 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 612ed3435c0d..88d99ea77723 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -16,6 +16,8 @@ CFLAGS_REMOVE_ftrace.o = -pg CFLAGS_REMOVE_early_printk.o = -pg endif +CFLAGS_irq.o := -I$(src)/../include/asm/trace + obj-y := process_$(BITS).o signal.o entry_$(BITS).o obj-y += traps.o irq.o irq_$(BITS).o dumpstack_$(BITS).o obj-y += time.o ioport.o ldt.o dumpstack.o nmi.o @@ -103,6 +105,7 @@ obj-$(CONFIG_OF) += devicetree.o obj-$(CONFIG_UPROBES) += uprobes.o obj-$(CONFIG_PERF_EVENTS) += perf_regs.o +obj-$(CONFIG_TRACING) += tracepoint.o ### # 64 bit specific files diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 1600b1ca4f04..99663b59123a 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -35,6 +35,7 @@ #include <linux/smp.h> #include <linux/mm.h> +#include <asm/trace/irq_vectors.h> #include <asm/irq_remapping.h> #include <asm/perf_event.h> #include <asm/x86_init.h> @@ -919,17 +920,35 @@ void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) /* * NOTE! We'd better ACK the irq immediately, * because timer handling can be slow. + * + * update_process_times() expects us to have done irq_enter(). + * Besides, if we don't timer interrupts ignore the global + * interrupt lock, which is the WrongThing (tm) to do. */ - ack_APIC_irq(); + entering_ack_irq(); + local_apic_timer_interrupt(); + exiting_irq(); + + set_irq_regs(old_regs); +} + +void __irq_entry smp_trace_apic_timer_interrupt(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + /* + * NOTE! We'd better ACK the irq immediately, + * because timer handling can be slow. + * * update_process_times() expects us to have done irq_enter(). * Besides, if we don't timer interrupts ignore the global * interrupt lock, which is the WrongThing (tm) to do. */ - irq_enter(); - exit_idle(); + entering_ack_irq(); + trace_local_timer_entry(LOCAL_TIMER_VECTOR); local_apic_timer_interrupt(); - irq_exit(); + trace_local_timer_exit(LOCAL_TIMER_VECTOR); + exiting_irq(); set_irq_regs(old_regs); } @@ -1907,12 +1926,10 @@ int __init APIC_init_uniprocessor(void) /* * This interrupt should _never_ happen with our APIC/SMP architecture */ -void smp_spurious_interrupt(struct pt_regs *regs) +static inline void __smp_spurious_interrupt(void) { u32 v; - irq_enter(); - exit_idle(); /* * Check if this really is a spurious interrupt and ACK it * if it is a vectored one. Just in case... @@ -1927,13 +1944,28 @@ void smp_spurious_interrupt(struct pt_regs *regs) /* see sw-dev-man vol 3, chapter 7.4.13.5 */ pr_info("spurious APIC interrupt on CPU#%d, " "should never happen.\n", smp_processor_id()); - irq_exit(); +} + +void smp_spurious_interrupt(struct pt_regs *regs) +{ + entering_irq(); + __smp_spurious_interrupt(); + exiting_irq(); +} + +void smp_trace_spurious_interrupt(struct pt_regs *regs) +{ + entering_irq(); + trace_spurious_apic_entry(SPURIOUS_APIC_VECTOR); + __smp_spurious_interrupt(); + trace_spurious_apic_exit(SPURIOUS_APIC_VECTOR); + exiting_irq(); } /* * This interrupt should never happen with our APIC/SMP architecture */ -void smp_error_interrupt(struct pt_regs *regs) +static inline void __smp_error_interrupt(struct pt_regs *regs) { u32 v0, v1; u32 i = 0; @@ -1948,8 +1980,6 @@ void smp_error_interrupt(struct pt_regs *regs) "Illegal register address", /* APIC Error Bit 7 */ }; - irq_enter(); - exit_idle(); /* First tickle the hardware, only then report what went on. -- REW */ v0 = apic_read(APIC_ESR); apic_write(APIC_ESR, 0); @@ -1970,7 +2000,22 @@ void smp_error_interrupt(struct pt_regs *regs) apic_printk(APIC_DEBUG, KERN_CONT "\n"); - irq_exit(); +} + +void smp_error_interrupt(struct pt_regs *regs) +{ + entering_irq(); + __smp_error_interrupt(regs); + exiting_irq(); +} + +void smp_trace_error_interrupt(struct pt_regs *regs) +{ + entering_irq(); + trace_error_apic_entry(ERROR_APIC_VECTOR); + __smp_error_interrupt(regs); + trace_error_apic_exit(ERROR_APIC_VECTOR); + exiting_irq(); } /** diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index a4a07c0acb1f..548bd039784e 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1072,8 +1072,8 @@ __setup("clearcpuid=", setup_disablecpuid); #ifdef CONFIG_X86_64 struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table }; -struct desc_ptr nmi_idt_descr = { NR_VECTORS * 16 - 1, - (unsigned long) nmi_idt_table }; +struct desc_ptr debug_idt_descr = { NR_VECTORS * 16 - 1, + (unsigned long) debug_idt_table }; DEFINE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __aligned(PAGE_SIZE); @@ -1149,20 +1149,20 @@ int is_debug_stack(unsigned long addr) addr > (__get_cpu_var(debug_stack_addr) - DEBUG_STKSZ)); } -static DEFINE_PER_CPU(u32, debug_stack_use_ctr); +DEFINE_PER_CPU(u32, debug_idt_ctr); void debug_stack_set_zero(void) { - this_cpu_inc(debug_stack_use_ctr); - load_idt((const struct desc_ptr *)&nmi_idt_descr); + this_cpu_inc(debug_idt_ctr); + load_current_idt(); } void debug_stack_reset(void) { - if (WARN_ON(!this_cpu_read(debug_stack_use_ctr))) + if (WARN_ON(!this_cpu_read(debug_idt_ctr))) return; - if (this_cpu_dec_return(debug_stack_use_ctr) == 0) - load_idt((const struct desc_ptr *)&idt_descr); + if (this_cpu_dec_return(debug_idt_ctr) == 0) + load_current_idt(); } #else /* CONFIG_X86_64 */ @@ -1258,7 +1258,7 @@ void __cpuinit cpu_init(void) switch_to_new_gdt(cpu); loadsegment(fs, 0); - load_idt((const struct desc_ptr *)&idt_descr); + load_current_idt(); memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8); syscall_init(); @@ -1335,7 +1335,7 @@ void __cpuinit cpu_init(void) if (cpu_has_vme || cpu_has_tsc || cpu_has_de) clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); - load_idt(&idt_descr); + load_current_idt(); switch_to_new_gdt(cpu); /* diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c index 47a1870279aa..2f3a7995e56a 100644 --- a/arch/x86/kernel/cpu/mcheck/therm_throt.c +++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c @@ -29,6 +29,7 @@ #include <asm/idle.h> #include <asm/mce.h> #include <asm/msr.h> +#include <asm/trace/irq_vectors.h> /* How long to wait between reporting thermal events */ #define CHECK_INTERVAL (300 * HZ) @@ -378,15 +379,26 @@ static void unexpected_thermal_interrupt(void) static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt; -asmlinkage void smp_thermal_interrupt(struct pt_regs *regs) +static inline void __smp_thermal_interrupt(void) { - irq_enter(); - exit_idle(); inc_irq_stat(irq_thermal_count); smp_thermal_vector(); - irq_exit(); - /* Ack only at the end to avoid potential reentry */ - ack_APIC_irq(); +} + +asmlinkage void smp_thermal_interrupt(struct pt_regs *regs) +{ + entering_irq(); + __smp_thermal_interrupt(); + exiting_ack_irq(); +} + +asmlinkage void smp_trace_thermal_interrupt(struct pt_regs *regs) +{ + entering_irq(); + trace_thermal_apic_entry(THERMAL_APIC_VECTOR); + __smp_thermal_interrupt(); + trace_thermal_apic_exit(THERMAL_APIC_VECTOR); + exiting_ack_irq(); } /* Thermal monitoring depends on APIC, ACPI and clock modulation */ diff --git a/arch/x86/kernel/cpu/mcheck/threshold.c b/arch/x86/kernel/cpu/mcheck/threshold.c index aa578cadb940..fe6b1c86645b 100644 --- a/arch/x86/kernel/cpu/mcheck/threshold.c +++ b/arch/x86/kernel/cpu/mcheck/threshold.c @@ -8,6 +8,7 @@ #include <asm/apic.h> #include <asm/idle.h> #include <asm/mce.h> +#include <asm/trace/irq_vectors.h> static void default_threshold_interrupt(void) { @@ -17,13 +18,24 @@ static void default_threshold_interrupt(void) void (*mce_threshold_vector)(void) = default_threshold_interrupt; -asmlinkage void smp_threshold_interrupt(void) +static inline void __smp_threshold_interrupt(void) { - irq_enter(); - exit_idle(); inc_irq_stat(irq_threshold_count); mce_threshold_vector(); - irq_exit(); - /* Ack only at the end to avoid potential reentry */ - ack_APIC_irq(); +} + +asmlinkage void smp_threshold_interrupt(void) +{ + entering_irq(); + __smp_threshold_interrupt(); + exiting_ack_irq(); +} + +asmlinkage void smp_trace_threshold_interrupt(void) +{ + entering_irq(); + trace_threshold_apic_entry(THRESHOLD_APIC_VECTOR); + __smp_threshold_interrupt(); + trace_threshold_apic_exit(THRESHOLD_APIC_VECTOR); + exiting_ack_irq(); } diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 8f3e2dec1df3..2cfbc3a3a2dd 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -801,7 +801,17 @@ ENTRY(name) \ CFI_ENDPROC; \ ENDPROC(name) -#define BUILD_INTERRUPT(name, nr) BUILD_INTERRUPT3(name, nr, smp_##name) + +#ifdef CONFIG_TRACING +#define TRACE_BUILD_INTERRUPT(name, nr) \ + BUILD_INTERRUPT3(trace_##name, nr, smp_trace_##name) +#else +#define TRACE_BUILD_INTERRUPT(name, nr) +#endif + +#define BUILD_INTERRUPT(name, nr) \ + BUILD_INTERRUPT3(name, nr, smp_##name); \ + TRACE_BUILD_INTERRUPT(name, nr) /* The include is where all of the SMP etc. interrupts come from */ #include <asm/entry_arch.h> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 5fe1fb2d1490..1b69951a81e2 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1138,7 +1138,7 @@ END(common_interrupt) /* * APIC interrupts. */ -.macro apicinterrupt num sym do_sym +.macro apicinterrupt3 num sym do_sym ENTRY(\sym) INTR_FRAME ASM_CLAC @@ -1150,15 +1150,32 @@ ENTRY(\sym) END(\sym) .endm +#ifdef CONFIG_TRACING +#define trace(sym) trace_##sym +#define smp_trace(sym) smp_trace_##sym + +.macro trace_apicinterrupt num sym +apicinterrupt3 \num trace(\sym) smp_trace(\sym) +.endm +#else +.macro trace_apicinterrupt num sym do_sym +.endm +#endif + +.macro apicinterrupt num sym do_sym +apicinterrupt3 \num \sym \do_sym +trace_apicinterrupt \num \sym +.endm + #ifdef CONFIG_SMP -apicinterrupt IRQ_MOVE_CLEANUP_VECTOR \ +apicinterrupt3 IRQ_MOVE_CLEANUP_VECTOR \ irq_move_cleanup_interrupt smp_irq_move_cleanup_interrupt -apicinterrupt REBOOT_VECTOR \ +apicinterrupt3 REBOOT_VECTOR \ reboot_interrupt smp_reboot_interrupt #endif #ifdef CONFIG_X86_UV -apicinterrupt UV_BAU_MESSAGE \ +apicinterrupt3 UV_BAU_MESSAGE \ uv_bau_message_intr1 uv_bau_message_interrupt #endif apicinterrupt LOCAL_TIMER_VECTOR \ @@ -1167,14 +1184,19 @@ apicinterrupt X86_PLATFORM_IPI_VECTOR \ x86_platform_ipi smp_x86_platform_ipi #ifdef CONFIG_HAVE_KVM -apicinterrupt POSTED_INTR_VECTOR \ +apicinterrupt3 POSTED_INTR_VECTOR \ kvm_posted_intr_ipi smp_kvm_posted_intr_ipi #endif +#ifdef CONFIG_X86_MCE_THRESHOLD apicinterrupt THRESHOLD_APIC_VECTOR \ threshold_interrupt smp_threshold_interrupt +#endif + +#ifdef CONFIG_X86_THERMAL_VECTOR apicinterrupt THERMAL_APIC_VECTOR \ thermal_interrupt smp_thermal_interrupt +#endif #ifdef CONFIG_SMP apicinterrupt CALL_FUNCTION_SINGLE_VECTOR \ @@ -1451,13 +1473,13 @@ ENTRY(xen_failsafe_callback) CFI_ENDPROC END(xen_failsafe_callback) -apicinterrupt HYPERVISOR_CALLBACK_VECTOR \ +apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \ xen_hvm_callback_vector xen_evtchn_do_upcall #endif /* CONFIG_XEN */ #if IS_ENABLED(CONFIG_HYPERV) -apicinterrupt HYPERVISOR_CALLBACK_VECTOR \ +apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \ hyperv_callback_vector hyperv_vector_handler #endif /* CONFIG_HYPERV */ diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 321d65ebaffe..5e4d8a8a5c40 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -518,9 +518,15 @@ ENTRY(idt_table) .skip IDT_ENTRIES * 16 .align L1_CACHE_BYTES -ENTRY(nmi_idt_table) +ENTRY(debug_idt_table) .skip IDT_ENTRIES * 16 +#ifdef CONFIG_TRACING + .align L1_CACHE_BYTES +ENTRY(trace_idt_table) + .skip IDT_ENTRIES * 16 +#endif + __PAGE_ALIGNED_BSS NEXT_PAGE(empty_zero_page) .skip PAGE_SIZE diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index ac0631d8996f..3a8185c042a2 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -18,6 +18,9 @@ #include <asm/mce.h> #include <asm/hw_irq.h> +#define CREATE_TRACE_POINTS +#include <asm/trace/irq_vectors.h> + atomic_t irq_err_count; /* Function pointer for generic interrupt vector handling */ @@ -204,23 +207,21 @@ unsigned int __irq_entry do_IRQ(struct pt_regs *regs) /* * Handler for X86_PLATFORM_IPI_VECTOR. */ -void smp_x86_platform_ipi(struct pt_regs *regs) +void __smp_x86_platform_ipi(void) { - struct pt_regs *old_regs = set_irq_regs(regs); - - ack_APIC_irq(); - - irq_enter(); - - exit_idle(); - inc_irq_stat(x86_platform_ipis); if (x86_platform_ipi_callback) x86_platform_ipi_callback(); +} - irq_exit(); +void smp_x86_platform_ipi(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + entering_ack_irq(); + __smp_x86_platform_ipi(); + exiting_irq(); set_irq_regs(old_regs); } @@ -246,6 +247,18 @@ void smp_kvm_posted_intr_ipi(struct pt_regs *regs) } #endif +void smp_trace_x86_platform_ipi(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + entering_ack_irq(); + trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR); + __smp_x86_platform_ipi(); + trace_x86_platform_ipi_exit(X86_PLATFORM_IPI_VECTOR); + exiting_irq(); + set_irq_regs(old_regs); +} + EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq); #ifdef CONFIG_HOTPLUG_CPU diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c index ca8f703a1e70..636a55e4a13c 100644 --- a/arch/x86/kernel/irq_work.c +++ b/arch/x86/kernel/irq_work.c @@ -8,14 +8,34 @@ #include <linux/irq_work.h> #include <linux/hardirq.h> #include <asm/apic.h> +#include <asm/trace/irq_vectors.h> -void smp_irq_work_interrupt(struct pt_regs *regs) +static inline void irq_work_entering_irq(void) { irq_enter(); ack_APIC_irq(); +} + +static inline void __smp_irq_work_interrupt(void) +{ inc_irq_stat(apic_irq_work_irqs); irq_work_run(); - irq_exit(); +} + +void smp_irq_work_interrupt(struct pt_regs *regs) +{ + irq_work_entering_irq(); + __smp_irq_work_interrupt(); + exiting_irq(); +} + +void smp_trace_irq_work_interrupt(struct pt_regs *regs) +{ + irq_work_entering_irq(); + trace_irq_work_entry(IRQ_WORK_VECTOR); + __smp_irq_work_interrupt(); + trace_irq_work_exit(IRQ_WORK_VECTOR); + exiting_irq(); } void arch_irq_work_raise(void) diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 48d2b7ded422..f4fe0b8879e0 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -30,6 +30,7 @@ #include <asm/proto.h> #include <asm/apic.h> #include <asm/nmi.h> +#include <asm/trace/irq_vectors.h> /* * Some notes on x86 processor bugs affecting SMP operation: * @@ -249,32 +250,80 @@ finish: /* * Reschedule call back. */ -void smp_reschedule_interrupt(struct pt_regs *regs) +static inline void __smp_reschedule_interrupt(void) { - ack_APIC_irq(); inc_irq_stat(irq_resched_count); scheduler_ipi(); +} + +void smp_reschedule_interrupt(struct pt_regs *regs) +{ + ack_APIC_irq(); + __smp_reschedule_interrupt(); /* * KVM uses this interrupt to force a cpu out of guest mode */ } -void smp_call_function_interrupt(struct pt_regs *regs) +void smp_trace_reschedule_interrupt(struct pt_regs *regs) +{ + ack_APIC_irq(); + trace_reschedule_entry(RESCHEDULE_VECTOR); + __smp_reschedule_interrupt(); + trace_reschedule_exit(RESCHEDULE_VECTOR); + /* + * KVM uses this interrupt to force a cpu out of guest mode + */ +} + +static inline void call_function_entering_irq(void) { ack_APIC_irq(); irq_enter(); +} + +static inline void __smp_call_function_interrupt(void) +{ generic_smp_call_function_interrupt(); inc_irq_stat(irq_call_count); - irq_exit(); } -void smp_call_function_single_interrupt(struct pt_regs *regs) +void smp_call_function_interrupt(struct pt_regs *regs) +{ + call_function_entering_irq(); + __smp_call_function_interrupt(); + exiting_irq(); +} + +void smp_trace_call_function_interrupt(struct pt_regs *regs) +{ + call_function_entering_irq(); + trace_call_function_entry(CALL_FUNCTION_VECTOR); + __smp_call_function_interrupt(); + trace_call_function_exit(CALL_FUNCTION_VECTOR); + exiting_irq(); +} + +static inline void __smp_call_function_single_interrupt(void) { - ack_APIC_irq(); - irq_enter(); generic_smp_call_function_single_interrupt(); inc_irq_stat(irq_call_count); - irq_exit(); +} + +void smp_call_function_single_interrupt(struct pt_regs *regs) +{ + call_function_entering_irq(); + __smp_call_function_single_interrupt(); + exiting_irq(); +} + +void smp_trace_call_function_single_interrupt(struct pt_regs *regs) +{ + call_function_entering_irq(); + trace_call_function_single_entry(CALL_FUNCTION_SINGLE_VECTOR); + __smp_call_function_single_interrupt(); + trace_call_function_single_exit(CALL_FUNCTION_SINGLE_VECTOR); + exiting_irq(); } static int __init nonmi_ipi_setup(char *str) diff --git a/arch/x86/kernel/tracepoint.c b/arch/x86/kernel/tracepoint.c new file mode 100644 index 000000000000..4e584a8d6edd --- /dev/null +++ b/arch/x86/kernel/tracepoint.c @@ -0,0 +1,61 @@ +/* + * Code for supporting irq vector tracepoints. + * + * Copyright (C) 2013 Seiji Aguchi <seiji.aguchi@hds.com> + * + */ +#include <asm/hw_irq.h> +#include <asm/desc.h> +#include <linux/atomic.h> + +atomic_t trace_idt_ctr = ATOMIC_INIT(0); +struct desc_ptr trace_idt_descr = { NR_VECTORS * 16 - 1, + (unsigned long) trace_idt_table }; + +#ifndef CONFIG_X86_64 +gate_desc trace_idt_table[NR_VECTORS] __page_aligned_data + = { { { { 0, 0 } } }, }; +#endif + +static int trace_irq_vector_refcount; +static DEFINE_MUTEX(irq_vector_mutex); + +static void set_trace_idt_ctr(int val) +{ + atomic_set(&trace_idt_ctr, val); + /* Ensure the trace_idt_ctr is set before sending IPI */ + wmb(); +} + +static void switch_idt(void *arg) +{ + unsigned long flags; + + local_irq_save(flags); + load_current_idt(); + local_irq_restore(flags); +} + +void trace_irq_vector_regfunc(void) +{ + mutex_lock(&irq_vector_mutex); + if (!trace_irq_vector_refcount) { + set_trace_idt_ctr(1); + smp_call_function(switch_idt, NULL, 0); + switch_idt(NULL); + } + trace_irq_vector_refcount++; + mutex_unlock(&irq_vector_mutex); +} + +void trace_irq_vector_unregfunc(void) +{ + mutex_lock(&irq_vector_mutex); + trace_irq_vector_refcount--; + if (!trace_irq_vector_refcount) { + set_trace_idt_ctr(0); + smp_call_function(switch_idt, NULL, 0); + switch_idt(NULL); + } + mutex_unlock(&irq_vector_mutex); +} diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index ee3d8e510504..b0865e88d3cc 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -788,7 +788,7 @@ void __init trap_init(void) x86_init.irqs.trap_init(); #ifdef CONFIG_X86_64 - memcpy(&nmi_idt_table, &idt_table, IDT_ENTRIES * 16); + memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); set_nmi_gate(X86_TRAP_DB, &debug); set_nmi_gate(X86_TRAP_BP, &int3); #endif |