x86: UV, SGI RTC: add generic system vector

This patch allocates a system interrupt vector for various platform
specific uses.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: john stultz <johnstul@us.ibm.com>
LKML-Reference: <20090304185605.GA24419@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index 854d538ae85797a27601df6ff051ac3c44fe38f5..c2e6bedaf25873b75df79f6a0f809b4ad9070787 100644 (file)
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -33,6 +33,8 @@ BUILD_INTERRUPT3(invalidate_interrupt7,INVALIDATE_TLB_VECTOR_START+7,
                 smp_invalidate_interrupt)
 #endif
 
+BUILD_INTERRUPT(generic_interrupt, GENERIC_INTERRUPT_VECTOR)
+
 /*
  * every pentium local APIC has two 'local interrupts', with a
  * soft-definable vector attached to both interrupts, one of

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 176f058e715947cbd7b803b90654e14b307dc8ea..039db6aa8e0271951706ee20bd9b819098f8002a 100644 (file)
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -12,6 +12,7 @@ typedef struct {
        unsigned int apic_timer_irqs;   /* arch dependent */
        unsigned int irq_spurious_count;
 #endif
+       unsigned int generic_irqs;      /* arch dependent */
 #ifdef CONFIG_SMP
        unsigned int irq_resched_count;
        unsigned int irq_call_count;

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 370e1c83bb49a27048d4641546bef5f76efd0faa..b762ea49bd703ab3b28958cf83b6908e825e57a4 100644 (file)
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -27,6 +27,7 @@
 
 /* Interrupt handlers registered during init_IRQ */
 extern void apic_timer_interrupt(void);
+extern void generic_interrupt(void);
 extern void error_interrupt(void);
 extern void spurious_interrupt(void);
 extern void thermal_interrupt(void);

diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 107eb2196691134cd4f8bc2944e953a47e58805d..f38481bcd45538f26d640a2c460a3510246510d2 100644 (file)
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -36,6 +36,7 @@ static inline int irq_canonicalize(int irq)
 extern void fixup_irqs(void);
 #endif
 
+extern void (*generic_interrupt_extension)(void);
 extern void init_IRQ(void);
 extern void native_init_IRQ(void);
 extern bool handle_irq(unsigned irq, struct pt_regs *regs);

diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 8a285f356f8aef9e0e64b1210303c7d82acdfa19..3cbd79bbb47c82613341fca01ee6e174319342fe 100644 (file)
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -111,6 +111,11 @@
  */
 #define LOCAL_PERF_VECTOR              0xee
 
+/*
+ * Generic system vector for platform specific use
+ */
+#define GENERIC_INTERRUPT_VECTOR       0xed
+
 /*
  * First APIC vector available to drivers: (vectors 0x30-0xee) we
  * start at 0x31(0x41) to spread out vectors evenly between priority

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 83d1836b9467e74069d71805a65a53dbbcbce1b2..7ba4621c0dfa018393833c3f87703c0db126e38a 100644 (file)
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -984,6 +984,8 @@ apicinterrupt UV_BAU_MESSAGE \
 #endif
 apicinterrupt LOCAL_TIMER_VECTOR \
        apic_timer_interrupt smp_apic_timer_interrupt
+apicinterrupt GENERIC_INTERRUPT_VECTOR \
+       generic_interrupt smp_generic_interrupt
 
 #ifdef CONFIG_SMP
 apicinterrupt INVALIDATE_TLB_VECTOR_START+0 \

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index f13ca1650aafce84b1ecf5c1e665f1bbf4a9f5c6..b864341dcc45f9025bb1a91aaa6fff954a5ca111 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -15,6 +15,9 @@
 
 atomic_t irq_err_count;
 
+/* Function pointer for generic interrupt vector handling */
+void (*generic_interrupt_extension)(void) = NULL;
+
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.
  * each architecture has to answer this themselves.
@@ -56,6 +59,12 @@ static int show_other_interrupts(struct seq_file *p)
                seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
        seq_printf(p, "  Local timer interrupts\n");
 #endif
+       if (generic_interrupt_extension) {
+               seq_printf(p, "PLT: ");
+               for_each_online_cpu(j)
+                       seq_printf(p, "%10u ", irq_stats(j)->generic_irqs);
+               seq_printf(p, "  Platform interrupts\n");
+       }
 #ifdef CONFIG_SMP
        seq_printf(p, "RES: ");
        for_each_online_cpu(j)
@@ -163,6 +172,8 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
 #ifdef CONFIG_X86_LOCAL_APIC
        sum += irq_stats(cpu)->apic_timer_irqs;
 #endif
+       if (generic_interrupt_extension)
+               sum += irq_stats(cpu)->generic_irqs;
 #ifdef CONFIG_SMP
        sum += irq_stats(cpu)->irq_resched_count;
        sum += irq_stats(cpu)->irq_call_count;
@@ -226,4 +237,27 @@ unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
        return 1;
 }
 
+/*
+ * Handler for GENERIC_INTERRUPT_VECTOR.
+ */
+void smp_generic_interrupt(struct pt_regs *regs)
+{
+       struct pt_regs *old_regs = set_irq_regs(regs);
+
+       ack_APIC_irq();
+
+       exit_idle();
+
+       irq_enter();
+
+       inc_irq_stat(generic_irqs);
+
+       if (generic_interrupt_extension)
+               generic_interrupt_extension();
+
+       irq_exit();
+
+       set_irq_regs(old_regs);
+}
+
 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);

diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c
index 50b8c3a3006cb6f22ae0aa0f0cf3a50071475154..bc132610544829de0f38a12dd8461d73104b39a2 100644 (file)
--- a/arch/x86/kernel/irqinit_32.c
+++ b/arch/x86/kernel/irqinit_32.c
@@ -175,6 +175,9 @@ void __init native_init_IRQ(void)
        /* self generated IPI for local APIC timer */
        alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 
+       /* generic IPI for platform specific use */
+       alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
+
        /* IPI vectors for APIC spurious and error interrupts */
        alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
        alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);

diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c
index da481a1e3f303f8fe3bf10995e8e218cc556f2d4..c7a49e0ffbfbc0b4b2b0cd12b01d5294ca73745c 100644 (file)
--- a/arch/x86/kernel/irqinit_64.c
+++ b/arch/x86/kernel/irqinit_64.c
@@ -147,6 +147,9 @@ static void __init apic_intr_init(void)
        /* self generated IPI for local APIC timer */
        alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
 
+       /* generic IPI for platform specific use */
+       alloc_intr_gate(GENERIC_INTERRUPT_VECTOR, generic_interrupt);
+
        /* IPI vectors for APIC spurious and error interrupts */
        alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
        alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);