Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755817AbYJUVWJ (ORCPT ); Tue, 21 Oct 2008 17:22:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751575AbYJUVV4 (ORCPT ); Tue, 21 Oct 2008 17:21:56 -0400 Received: from relay1.sgi.com ([192.48.171.29]:37240 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750966AbYJUVVz (ORCPT ); Tue, 21 Oct 2008 17:21:55 -0400 Date: Tue, 21 Oct 2008 16:21:54 -0500 From: Dimitri Sivanich To: Ingo Molnar , Thomas Gleixner , linux-kernel@vger.kernel.org Cc: Dimitri Sivanich Subject: [PATCH 3/3] SGI RTC: add RTC system interrupt Message-ID: <20081021212154.GC4037@sgi.com> References: <20081021211740.GA3936@sgi.com> <20081021211921.GA4037@sgi.com> <20081021212031.GB4037@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081021212031.GB4037@sgi.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4741 Lines: 135 This patch allocates a system interrupt vector for architecture specific use in implementing RTC timer interrupts. Signed-off-by: Dimitri Sivanich Index: linux/arch/x86/kernel/entry_64.S =================================================================== --- linux.orig/arch/x86/kernel/entry_64.S 2008-10-21 12:06:52.000000000 -0500 +++ linux/arch/x86/kernel/entry_64.S 2008-10-21 12:10:47.000000000 -0500 @@ -858,6 +858,10 @@ ENTRY(apic_timer_interrupt) apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt END(apic_timer_interrupt) +ENTRY(uv_rtc_timer_intr) + apicinterrupt RTC_TIMER_VECTOR,uv_rtc_timer_interrupt +END(uv_rtc_timer_intr) + ENTRY(uv_bau_message_intr1) apicinterrupt 220,uv_bau_message_interrupt END(uv_bau_message_intr1) Index: linux/arch/x86/kernel/irqinit_64.c =================================================================== --- linux.orig/arch/x86/kernel/irqinit_64.c 2008-10-21 12:06:52.000000000 -0500 +++ linux/arch/x86/kernel/irqinit_64.c 2008-10-21 12:10:47.000000000 -0500 @@ -205,6 +205,9 @@ 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 RTC timers */ + alloc_intr_gate(RTC_TIMER_VECTOR, uv_rtc_timer_intr); + /* 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/include/asm-x86/irq_vectors.h =================================================================== --- linux.orig/include/asm-x86/irq_vectors.h 2008-10-21 12:06:52.000000000 -0500 +++ linux/include/asm-x86/irq_vectors.h 2008-10-21 12:10:47.000000000 -0500 @@ -90,6 +90,7 @@ * sources per level' errata. */ #define LOCAL_TIMER_VECTOR 0xef +#define RTC_TIMER_VECTOR 0xee /* * First APIC vector available to drivers: (vectors 0x30-0xee) we Index: linux/arch/x86/kernel/genx2apic_uv_x.c =================================================================== --- linux.orig/arch/x86/kernel/genx2apic_uv_x.c 2008-10-21 12:06:52.000000000 -0500 +++ linux/arch/x86/kernel/genx2apic_uv_x.c 2008-10-21 12:10:47.000000000 -0500 @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -356,6 +357,46 @@ static __init void uv_rtc_init(void) sn_rtc_cycles_per_second = ticks_per_sec; } +/* Function pointer for RTC interrupt handling */ +static void (*uv_rtc_interrupt_extension)(void); + +int +uv_rtc_reg_extension(void (*fn)(void)) +{ + if (uv_rtc_interrupt_extension) + return 1; + + uv_rtc_interrupt_extension = fn; + return 0; +} +EXPORT_SYMBOL_GPL(uv_rtc_reg_extension); + +void +uv_rtc_unreg_extension(void) +{ + if (uv_rtc_interrupt_extension) + uv_rtc_interrupt_extension = NULL; +} +EXPORT_SYMBOL_GPL(uv_rtc_unreg_extension); + +void uv_rtc_timer_interrupt(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + ack_APIC_irq(); + + exit_idle(); + + irq_enter(); + + if (uv_rtc_interrupt_extension) + uv_rtc_interrupt_extension(); + + irq_exit(); + + set_irq_regs(old_regs); +} + /* * Called on each cpu to initialize the per_cpu UV data area. * ZZZ hotplug not supported yet Index: linux/include/asm-x86/genapic_64.h =================================================================== --- linux.orig/include/asm-x86/genapic_64.h 2008-10-21 12:06:52.000000000 -0500 +++ linux/include/asm-x86/genapic_64.h 2008-10-21 12:10:47.000000000 -0500 @@ -49,6 +49,8 @@ extern int is_uv_system(void); extern struct genapic apic_x2apic_uv_x; DECLARE_PER_CPU(int, x2apic_extra_bits); +extern int uv_rtc_reg_extension(void (*fn)(void)); +extern void uv_rtc_unreg_extension(void); extern void uv_cpu_init(void); extern void uv_system_init(void); extern int uv_wakeup_secondary(int phys_apicid, unsigned int start_rip); Index: linux/include/asm-x86/hw_irq.h =================================================================== --- linux.orig/include/asm-x86/hw_irq.h 2008-10-21 12:06:52.000000000 -0500 +++ linux/include/asm-x86/hw_irq.h 2008-10-21 12:10:47.000000000 -0500 @@ -29,6 +29,7 @@ /* Interrupt handlers registered during init_IRQ */ extern void apic_timer_interrupt(void); +extern void uv_rtc_timer_intr(void); extern void error_interrupt(void); extern void spurious_interrupt(void); extern void thermal_interrupt(void); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/