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Date: Fri, 19 Dec 2008 10:09:19 -0600
From: Dimitri Sivanich <sivanich@....com>
To: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2 v5] SGI RTC: add generic timer system interrupt
This patch allocates a system interrupt vector for platform specific use
in implementing timer interrupts.
Signed-off-by: Dimitri Sivanich <sivanich@....com>
---
Refreshed for latest -tip.
arch/x86/include/asm/hw_irq.h | 1
arch/x86/include/asm/irq.h | 2 +
arch/x86/include/asm/irq_vectors.h | 5 +++
arch/x86/kernel/entry_64.S | 2 +
arch/x86/kernel/irqinit_64.c | 45 +++++++++++++++++++++++++++++++++
5 files changed, 55 insertions(+)
Index: linux/arch/x86/kernel/entry_64.S
===================================================================
--- linux.orig/arch/x86/kernel/entry_64.S 2008-12-19 10:02:26.000000000 -0600
+++ linux/arch/x86/kernel/entry_64.S 2008-12-19 10:02:28.000000000 -0600
@@ -985,6 +985,8 @@ apicinterrupt UV_BAU_MESSAGE \
uv_bau_message_intr1 uv_bau_message_interrupt
apicinterrupt LOCAL_TIMER_VECTOR \
apic_timer_interrupt smp_apic_timer_interrupt
+apicinterrupt GENERIC_TIMER_VECTOR \
+ generic_timer_interrupt smp_generic_timer_interrupt
#ifdef CONFIG_SMP
apicinterrupt INVALIDATE_TLB_VECTOR_START+0 \
Index: linux/arch/x86/kernel/irqinit_64.c
===================================================================
--- linux.orig/arch/x86/kernel/irqinit_64.c 2008-12-19 10:02:26.000000000 -0600
+++ linux/arch/x86/kernel/irqinit_64.c 2008-12-19 10:02:28.000000000 -0600
@@ -22,6 +22,7 @@
#include <asm/desc.h>
#include <asm/apic.h>
#include <asm/i8259.h>
+#include <asm/idle.h>
/*
* ISA PIC or low IO-APIC triggered (INTA-cycle or APIC) interrupts:
@@ -93,6 +94,47 @@ void __init init_ISA_irqs(void)
void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
+
+/* Function pointer for generic timer interrupt handling */
+static void (*generic_timer_interrupt_extension)(void);
+
+int
+register_generic_timer_extension(void (*fn)(void))
+{
+ if (generic_timer_interrupt_extension)
+ return 1;
+
+ generic_timer_interrupt_extension = fn;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(register_generic_timer_extension);
+
+void
+unregister_generic_timer_extension(void)
+{
+ if (generic_timer_interrupt_extension)
+ generic_timer_interrupt_extension = NULL;
+}
+EXPORT_SYMBOL_GPL(unregister_generic_timer_extension);
+
+void smp_generic_timer_interrupt(struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ ack_APIC_irq();
+
+ exit_idle();
+
+ irq_enter();
+
+ if (generic_timer_interrupt_extension)
+ generic_timer_interrupt_extension();
+
+ irq_exit();
+
+ set_irq_regs(old_regs);
+}
+
static void __init smp_intr_init(void)
{
#ifdef CONFIG_SMP
@@ -134,6 +176,9 @@ static void __init apic_intr_init(void)
/* self generated IPI for local APIC timer */
alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
+ /* IPI for platform specific timers */
+ alloc_intr_gate(GENERIC_TIMER_VECTOR, generic_timer_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);
Index: linux/arch/x86/include/asm/irq_vectors.h
===================================================================
--- linux.orig/arch/x86/include/asm/irq_vectors.h 2008-12-19 10:02:26.000000000 -0600
+++ linux/arch/x86/include/asm/irq_vectors.h 2008-12-19 10:02:28.000000000 -0600
@@ -92,6 +92,11 @@
#define LOCAL_PERF_VECTOR 0xee
/*
+ * Generic timer vector for platform specific use
+ */
+#define GENERIC_TIMER_VECTOR 0xed
+
+/*
* First APIC vector available to drivers: (vectors 0x30-0xee) we
* start at 0x31(0x41) to spread out vectors evenly between priority
* levels. (0x80 is the syscall vector)
Index: linux/arch/x86/include/asm/hw_irq.h
===================================================================
--- linux.orig/arch/x86/include/asm/hw_irq.h 2008-12-19 10:02:26.000000000 -0600
+++ linux/arch/x86/include/asm/hw_irq.h 2008-12-19 10:02:28.000000000 -0600
@@ -29,6 +29,7 @@
/* Interrupt handlers registered during init_IRQ */
extern void apic_timer_interrupt(void);
+extern void generic_timer_interrupt(void);
extern void error_interrupt(void);
extern void perf_counter_interrupt(void);
Index: linux/arch/x86/include/asm/irq.h
===================================================================
--- linux.orig/arch/x86/include/asm/irq.h 2008-12-19 10:02:26.000000000 -0600
+++ linux/arch/x86/include/asm/irq.h 2008-12-19 10:02:28.000000000 -0600
@@ -38,6 +38,8 @@ extern void fixup_irqs(void);
extern unsigned int do_IRQ(struct pt_regs *regs);
extern void init_IRQ(void);
+extern int register_generic_timer_extension(void (*fn)(void));
+extern void unregister_generic_timer_extension(void);
extern void native_init_IRQ(void);
/* Interrupt vector management */
--
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