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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
This commit is contained in:
Linus Torvalds 2013-07-02 16:31:49 -07:00
parent 3045f94a20 5236eb968e
commit 96a3d998fb
24 changed files with 605 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
arch/x86/include/asm/apic.h
View File

@ -12,6 +12,7 @@
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/msr.h>
#include <asm/idle.h>
#define ARCH_APICTIMER_STOPS_ON_C3 1
@ -687,5 +688,31 @@ extern int default_check_phys_apicid_present(int phys_apicid);
#endif
#endif /* CONFIG_X86_LOCAL_APIC */
extern void irq_enter(void);
extern void irq_exit(void);
static inline void entering_irq(void)
{
irq_enter();
exit_idle();
}
static inline void entering_ack_irq(void)
{
ack_APIC_irq();
entering_irq();
}
static inline void exiting_irq(void)
{
irq_exit();
}
static inline void exiting_ack_irq(void)
{
irq_exit();
/* Ack only at the end to avoid potential reentry */
ack_APIC_irq();
}
#endif /* _ASM_X86_APIC_H */

117
arch/x86/include/asm/desc.h
View File

@ -36,8 +36,8 @@ static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *in
extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
extern struct desc_ptr nmi_idt_descr;
extern gate_desc nmi_idt_table[];
extern struct desc_ptr debug_idt_descr;
extern gate_desc debug_idt_table[];
struct gdt_page {
struct desc_struct gdt[GDT_ENTRIES];
@ -316,7 +316,20 @@ static inline void set_nmi_gate(int gate, void *addr)
gate_desc s;
pack_gate(&s, GATE_INTERRUPT, (unsigned long)addr, 0, 0, __KERNEL_CS);
write_idt_entry(nmi_idt_table, gate, &s);
write_idt_entry(debug_idt_table, gate, &s);
}
#endif
#ifdef CONFIG_TRACING
extern struct desc_ptr trace_idt_descr;
extern gate_desc trace_idt_table[];
static inline void write_trace_idt_entry(int entry, const gate_desc *gate)
{
write_idt_entry(trace_idt_table, entry, gate);
}
#else
static inline void write_trace_idt_entry(int entry, const gate_desc *gate)
{
}
#endif
@ -331,6 +344,7 @@ static inline void _set_gate(int gate, unsigned type, void *addr,
* setup time
*/
write_idt_entry(idt_table, gate, &s);
write_trace_idt_entry(gate, &s);
}
/*
@ -360,12 +374,39 @@ static inline void alloc_system_vector(int vector)
}
}
static inline void alloc_intr_gate(unsigned int n, void *addr)
#ifdef CONFIG_TRACING
static inline void trace_set_intr_gate(unsigned int gate, void *addr)
{
gate_desc s;
pack_gate(&s, GATE_INTERRUPT, (unsigned long)addr, 0, 0, __KERNEL_CS);
write_idt_entry(trace_idt_table, gate, &s);
}
static inline void __trace_alloc_intr_gate(unsigned int n, void *addr)
{
trace_set_intr_gate(n, addr);
}
#else
static inline void trace_set_intr_gate(unsigned int gate, void *addr)
{
}
#define __trace_alloc_intr_gate(n, addr)
#endif
static inline void __alloc_intr_gate(unsigned int n, void *addr)
{
alloc_system_vector(n);
set_intr_gate(n, addr);
}
#define alloc_intr_gate(n, addr) \
do { \
alloc_system_vector(n); \
__alloc_intr_gate(n, addr); \
__trace_alloc_intr_gate(n, trace_##addr); \
} while (0)
/*
* This routine sets up an interrupt gate at directory privilege level 3.
*/
@ -405,4 +446,70 @@ static inline void set_system_intr_gate_ist(int n, void *addr, unsigned ist)
_set_gate(n, GATE_INTERRUPT, addr, 0x3, ist, __KERNEL_CS);
}
#ifdef CONFIG_X86_64
DECLARE_PER_CPU(u32, debug_idt_ctr);
static inline bool is_debug_idt_enabled(void)
{
if (this_cpu_read(debug_idt_ctr))
return true;
return false;
}
static inline void load_debug_idt(void)
{
load_idt((const struct desc_ptr *)&debug_idt_descr);
}
#else
static inline bool is_debug_idt_enabled(void)
{
return false;
}
static inline void load_debug_idt(void)
{
}
#endif
#ifdef CONFIG_TRACING
extern atomic_t trace_idt_ctr;
static inline bool is_trace_idt_enabled(void)
{
if (atomic_read(&trace_idt_ctr))
return true;
return false;
}
static inline void load_trace_idt(void)
{
load_idt((const struct desc_ptr *)&trace_idt_descr);
}
#else
static inline bool is_trace_idt_enabled(void)
{
return false;
}
static inline void load_trace_idt(void)
{
}
#endif
/*
* The load_current_idt() must be called with interrupts disabled
* to avoid races. That way the IDT will always be set back to the expected
* descriptor. It's also called when a CPU is being initialized, and
* that doesn't need to disable interrupts, as nothing should be
* bothering the CPU then.
*/
static inline void load_current_idt(void)
{
if (is_debug_idt_enabled())
load_debug_idt();
else if (is_trace_idt_enabled())
load_trace_idt();
else
load_idt((const struct desc_ptr *)&idt_descr);
}
#endif /* _ASM_X86_DESC_H */

8
arch/x86/include/asm/entry_arch.h
View File

@ -13,14 +13,16 @@
BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
BUILD_INTERRUPT(call_function_single_interrupt,CALL_FUNCTION_SINGLE_VECTOR)
BUILD_INTERRUPT(irq_move_cleanup_interrupt,IRQ_MOVE_CLEANUP_VECTOR)
BUILD_INTERRUPT(reboot_interrupt,REBOOT_VECTOR)
BUILD_INTERRUPT3(irq_move_cleanup_interrupt, IRQ_MOVE_CLEANUP_VECTOR,
smp_irq_move_cleanup_interrupt)
BUILD_INTERRUPT3(reboot_interrupt, REBOOT_VECTOR, smp_reboot_interrupt)
#endif
BUILD_INTERRUPT(x86_platform_ipi, X86_PLATFORM_IPI_VECTOR)
#ifdef CONFIG_HAVE_KVM
BUILD_INTERRUPT(kvm_posted_intr_ipi, POSTED_INTR_VECTOR)
BUILD_INTERRUPT3(kvm_posted_intr_ipi, POSTED_INTR_VECTOR,
smp_kvm_posted_intr_ipi)
#endif
/*

17
arch/x86/include/asm/hw_irq.h
View File

@ -77,6 +77,23 @@ extern void threshold_interrupt(void);
extern void call_function_interrupt(void);
extern void call_function_single_interrupt(void);
#ifdef CONFIG_TRACING
/* Interrupt handlers registered during init_IRQ */
extern void trace_apic_timer_interrupt(void);
extern void trace_x86_platform_ipi(void);
extern void trace_error_interrupt(void);
extern void trace_irq_work_interrupt(void);
extern void trace_spurious_interrupt(void);
extern void trace_thermal_interrupt(void);
extern void trace_reschedule_interrupt(void);
extern void trace_threshold_interrupt(void);
extern void trace_call_function_interrupt(void);
extern void trace_call_function_single_interrupt(void);
#define trace_irq_move_cleanup_interrupt irq_move_cleanup_interrupt
#define trace_reboot_interrupt reboot_interrupt
#define trace_kvm_posted_intr_ipi kvm_posted_intr_ipi
#endif /* CONFIG_TRACING */
/* IOAPIC */
#define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1<<(x)) & io_apic_irqs))
extern unsigned long io_apic_irqs;

3
arch/x86/include/asm/mshyperv.h
View File

@ -12,6 +12,9 @@ struct ms_hyperv_info {
extern struct ms_hyperv_info ms_hyperv;
void hyperv_callback_vector(void);
#ifdef CONFIG_TRACING
#define trace_hyperv_callback_vector hyperv_callback_vector
#endif
void hyperv_vector_handler(struct pt_regs *regs);
void hv_register_vmbus_handler(int irq, irq_handler_t handler);

104
arch/x86/include/asm/trace/irq_vectors.h Normal file
View File

@ -0,0 +1,104 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM irq_vectors
#if !defined(_TRACE_IRQ_VECTORS_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_IRQ_VECTORS_H
#include <linux/tracepoint.h>
extern void trace_irq_vector_regfunc(void);
extern void trace_irq_vector_unregfunc(void);
DECLARE_EVENT_CLASS(x86_irq_vector,
TP_PROTO(int vector),
TP_ARGS(vector),
TP_STRUCT__entry(
__field( int, vector )
),
TP_fast_assign(
__entry->vector = vector;
),
TP_printk("vector=%d", __entry->vector) );
#define DEFINE_IRQ_VECTOR_EVENT(name) \
DEFINE_EVENT_FN(x86_irq_vector, name##_entry, \
TP_PROTO(int vector), \
TP_ARGS(vector), \
trace_irq_vector_regfunc, \
trace_irq_vector_unregfunc); \
DEFINE_EVENT_FN(x86_irq_vector, name##_exit, \
TP_PROTO(int vector), \
TP_ARGS(vector), \
trace_irq_vector_regfunc, \
trace_irq_vector_unregfunc);
/*
* local_timer - called when entering/exiting a local timer interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(local_timer);
/*
* reschedule - called when entering/exiting a reschedule vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(reschedule);
/*
* spurious_apic - called when entering/exiting a spurious apic vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(spurious_apic);
/*
* error_apic - called when entering/exiting an error apic vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(error_apic);
/*
* x86_platform_ipi - called when entering/exiting a x86 platform ipi interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(x86_platform_ipi);
/*
* irq_work - called when entering/exiting a irq work interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(irq_work);
/*
* call_function - called when entering/exiting a call function interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(call_function);
/*
* call_function_single - called when entering/exiting a call function
* single interrupt vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(call_function_single);
/*
* threshold_apic - called when entering/exiting a threshold apic interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(threshold_apic);
/*
* thermal_apic - called when entering/exiting a thermal apic interrupt
* vector handler
*/
DEFINE_IRQ_VECTOR_EVENT(thermal_apic);
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE irq_vectors
#endif /* _TRACE_IRQ_VECTORS_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

3
arch/x86/include/asm/uv/uv_bau.h
View File

@ -731,6 +731,9 @@ static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
}
extern void uv_bau_message_intr1(void);
#ifdef CONFIG_TRACING
#define trace_uv_bau_message_intr1 uv_bau_message_intr1
#endif
extern void uv_bau_timeout_intr1(void);
struct atomic_short {

3
arch/x86/kernel/Makefile
View File

@ -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

73
arch/x86/kernel/apic/apic.c
View File

@ -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.
*/
ack_APIC_irq();
/*
*
* 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();
local_apic_timer_interrupt();
irq_exit();
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.
*/
entering_ack_irq();
trace_local_timer_entry(LOCAL_TIMER_VECTOR);
local_apic_timer_interrupt();
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();
}
/**

20
arch/x86/kernel/cpu/common.c
View File

@ -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);
/*

24
arch/x86/kernel/cpu/mcheck/therm_throt.c
View File

@ -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 */

24
arch/x86/kernel/cpu/mcheck/threshold.c
View File

@ -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();
}

12
arch/x86/kernel/entry_32.S
View File

@ -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>

36
arch/x86/kernel/entry_64.S
View File

@ -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 */

8
arch/x86/kernel/head_64.S
View File

@ -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

33
arch/x86/kernel/irq.c
View File

@ -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

24
arch/x86/kernel/irq_work.c
View File

@ -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)

67
arch/x86/kernel/smp.c
View File

@ -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.
*/
static inline void __smp_reschedule_interrupt(void)
{
inc_irq_stat(irq_resched_count);
scheduler_ipi();
}
void smp_reschedule_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
inc_irq_stat(irq_resched_count);
scheduler_ipi();
__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_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)
{
generic_smp_call_function_single_interrupt();
inc_irq_stat(irq_call_count);
}
void smp_call_function_single_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
irq_enter();
generic_smp_call_function_single_interrupt();
inc_irq_stat(irq_call_count);
irq_exit();
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)

61
arch/x86/kernel/tracepoint.c Normal file
View File

@ -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);
}

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

@ -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

2
include/linux/tracepoint.h
View File

@ -378,6 +378,8 @@ static inline void tracepoint_synchronize_unregister(void)
#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT(template, name, proto, args) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_CONDITION(template, name, proto, \

5
include/trace/define_trace.h
View File

@ -44,6 +44,10 @@
#define DEFINE_EVENT(template, name, proto, args) \
DEFINE_TRACE(name)
#undef DEFINE_EVENT_FN
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
DEFINE_TRACE_FN(name, reg, unreg)
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_TRACE(name)
@ -91,6 +95,7 @@
#undef TRACE_EVENT_CONDITION
#undef DECLARE_EVENT_CLASS
#undef DEFINE_EVENT
#undef DEFINE_EVENT_FN
#undef DEFINE_EVENT_PRINT
#undef DEFINE_EVENT_CONDITION
#undef TRACE_HEADER_MULTI_READ

4
include/trace/ftrace.h
View File

@ -71,6 +71,10 @@
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) event_##name
#undef DEFINE_EVENT_FN
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))

3
include/xen/events.h
View File

@ -76,6 +76,9 @@ unsigned irq_from_evtchn(unsigned int evtchn);
/* Xen HVM evtchn vector callback */
void xen_hvm_callback_vector(void);
#ifdef CONFIG_TRACING
#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
#endif
extern int xen_have_vector_callback;
int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);