perf_counter/x86: Remove the IRQ (non-NMI) handling bits

Remove the IRQ (non-NMI) handling bits as NMI will be used always.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090603051255.GA2791@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/entry_arch.h

@@ -49,7 +49,6 @@ BUILD_INTERRUPT(error_interrupt,ERROR_APIC_VECTOR)
 BUILD_INTERRUPT(spurious_interrupt,SPURIOUS_APIC_VECTOR)
 
 #ifdef CONFIG_PERF_COUNTERS
-BUILD_INTERRUPT(perf_counter_interrupt, LOCAL_PERF_VECTOR)
 BUILD_INTERRUPT(perf_pending_interrupt, LOCAL_PENDING_VECTOR)
 #endif
 

arch/x86/include/asm/hw_irq.h

@@ -29,7 +29,6 @@
 extern void apic_timer_interrupt(void);
 extern void generic_interrupt(void);
 extern void error_interrupt(void);
-extern void perf_counter_interrupt(void);
 extern void perf_pending_interrupt(void);
 
 extern void spurious_interrupt(void);

arch/x86/include/asm/irq_vectors.h

@@ -106,11 +106,6 @@
  */
 #define LOCAL_TIMER_VECTOR		0xef
 
-/*
- * Performance monitoring interrupt vector:
- */
-#define LOCAL_PERF_VECTOR		0xee
-
 /*
  * Generic system vector for platform specific use
  */

arch/x86/kernel/cpu/perf_counter.c

@@ -40,7 +40,7 @@ struct cpu_hw_counters {
 struct x86_pmu {
 	const char	*name;
 	int		version;
-	int		(*handle_irq)(struct pt_regs *, int);
+	int		(*handle_irq)(struct pt_regs *);
 	void		(*disable_all)(void);
 	void		(*enable_all)(void);
 	void		(*enable)(struct hw_perf_counter *, int);
@@ -755,7 +755,7 @@ static void intel_pmu_reset(void)
  * This handler is triggered by the local APIC, so the APIC IRQ handling
  * rules apply:
  */
-static int intel_pmu_handle_irq(struct pt_regs *regs, int nmi)
+static int intel_pmu_handle_irq(struct pt_regs *regs)
 {
 	struct cpu_hw_counters *cpuc;
 	struct cpu_hw_counters;
@@ -794,7 +794,7 @@ again:
 		if (!intel_pmu_save_and_restart(counter))
 			continue;
 
-		if (perf_counter_overflow(counter, nmi, regs, 0))
+		if (perf_counter_overflow(counter, 1, regs, 0))
 			intel_pmu_disable_counter(&counter->hw, bit);
 	}
 
@@ -812,7 +812,7 @@ again:
 	return 1;
 }
 
-static int amd_pmu_handle_irq(struct pt_regs *regs, int nmi)
+static int amd_pmu_handle_irq(struct pt_regs *regs)
 {
 	int cpu, idx, handled = 0;
 	struct cpu_hw_counters *cpuc;
@@ -840,22 +840,13 @@ static int amd_pmu_handle_irq(struct pt_regs *regs, int nmi)
 		if (!x86_perf_counter_set_period(counter, hwc, idx))
 			continue;
 
-		if (perf_counter_overflow(counter, nmi, regs, 0))
+		if (perf_counter_overflow(counter, 1, regs, 0))
 			amd_pmu_disable_counter(hwc, idx);
 	}
 
 	return handled;
 }
 
-void smp_perf_counter_interrupt(struct pt_regs *regs)
-{
-	irq_enter();
-	apic_write(APIC_LVTPC, LOCAL_PERF_VECTOR);
-	ack_APIC_irq();
-	x86_pmu.handle_irq(regs, 0);
-	irq_exit();
-}
-
 void smp_perf_pending_interrupt(struct pt_regs *regs)
 {
 	irq_enter();
@@ -910,7 +901,7 @@ perf_counter_nmi_handler(struct notifier_block *self,
 	 * If the first NMI handles both, the latter will be empty and daze
 	 * the CPU.
 	 */
-	x86_pmu.handle_irq(regs, 1);
+	x86_pmu.handle_irq(regs);
 
 	return NOTIFY_STOP;
 }

arch/x86/kernel/entry_64.S

@@ -1026,8 +1026,6 @@ apicinterrupt SPURIOUS_APIC_VECTOR \
 	spurious_interrupt smp_spurious_interrupt
 
 #ifdef CONFIG_PERF_COUNTERS
-apicinterrupt LOCAL_PERF_VECTOR \
-	perf_counter_interrupt smp_perf_counter_interrupt
 apicinterrupt LOCAL_PENDING_VECTOR \
 	perf_pending_interrupt smp_perf_pending_interrupt
 #endif

arch/x86/kernel/irqinit_32.c

@@ -165,7 +165,6 @@ static void __init apic_intr_init(void)
 	alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 	alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
 # ifdef CONFIG_PERF_COUNTERS
-	alloc_intr_gate(LOCAL_PERF_VECTOR, perf_counter_interrupt);
 	alloc_intr_gate(LOCAL_PENDING_VECTOR, perf_pending_interrupt);
 # endif
 

arch/x86/kernel/irqinit_64.c

@@ -155,7 +155,6 @@ static void __init apic_intr_init(void)
 
 	/* Performance monitoring interrupt: */
 #ifdef CONFIG_PERF_COUNTERS
-	alloc_intr_gate(LOCAL_PERF_VECTOR, perf_counter_interrupt);
 	alloc_intr_gate(LOCAL_PENDING_VECTOR, perf_pending_interrupt);
 #endif
 }