From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Jiang Liu To: Benjamin Herrenschmidt , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "Rafael J. Wysocki" , Bjorn Helgaas , Randy Dunlap , Yinghai Lu , Borislav Petkov , Grant Likely , x86@kernel.org, Len Brown , Pavel Machek , Jiang Liu , Prarit Bhargava Cc: Konrad Rzeszutek Wilk , Andrew Morton , Tony Luck , Joerg Roedel , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Ingo Molnar , linux-pm@vger.kernel.org Subject: [Patch v4 14/16] x86, irq: Introduce helper to check whether an IOAPIC has been registered Date: Thu, 28 Aug 2014 10:22:39 +0800 Message-Id: <1409192561-19744-15-git-send-email-jiang.liu@linux.intel.com> In-Reply-To: <1409192561-19744-1-git-send-email-jiang.liu@linux.intel.com> References: <1409192561-19744-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-ID: Introduce acpi_ioapic_registered() to check whether an IOAPIC has already been registered, it will be used when enabling IOAPIC hotplug. Signed-off-by: Jiang Liu --- arch/x86/include/asm/io_apic.h | 1 + arch/x86/kernel/acpi/boot.c | 11 +++++++++++ arch/x86/kernel/apic/io_apic.c | 11 +++++++++++ include/linux/acpi.h | 1 + 4 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h index ce63cf34c93c..0db2b7037e4b 100644 --- a/arch/x86/include/asm/io_apic.h +++ b/arch/x86/include/asm/io_apic.h @@ -191,6 +191,7 @@ extern void mp_unmap_irq(int irq); extern int mp_register_ioapic(int id, u32 address, u32 gsi_base, struct ioapic_domain_cfg *cfg); extern int mp_unregister_ioapic(u32 gsi_base); +extern int mp_ioapic_registered(u32 gsi_base); extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq); extern void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq); diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 560a6d1cb0f4..6aa796f77b71 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -810,6 +810,17 @@ int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base) } EXPORT_SYMBOL(acpi_unregister_ioapic); +int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base) +{ + int ret; + + down_write(&acpi_ioapic_rwsem); + ret = mp_ioapic_registered(gsi_base); + up_write(&acpi_ioapic_rwsem); + + return ret; +} + static int __init acpi_parse_sbf(struct acpi_table_header *table) { struct acpi_table_boot *sb; diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index fc1e1f9567bc..e104993a2394 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -4010,6 +4010,17 @@ int mp_unregister_ioapic(u32 gsi_base) return 0; } +int mp_ioapic_registered(u32 gsi_base) +{ + int ioapic; + + for_each_ioapic(ioapic) + if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) + return 1; + + return 0; +} + int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq, irq_hw_number_t hwirq) { diff --git a/include/linux/acpi.h b/include/linux/acpi.h index b41c5aef5336..754d99d5f258 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -155,6 +155,7 @@ int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr); int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base); int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base); +int acpi_ioapic_registered(acpi_handle handle, u32 gsi_base); void acpi_irq_stats_init(void); extern u32 acpi_irq_handled; extern u32 acpi_irq_not_handled; -- 1.7.10.4