Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933314AbaFII0V (ORCPT ); Mon, 9 Jun 2014 04:26:21 -0400 Received: from mga14.intel.com ([192.55.52.115]:36965 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754768AbaFIIYO (ORCPT ); Mon, 9 Jun 2014 04:24:14 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,862,1389772800"; d="scan'208";a="352321939" From: Jiang Liu To: Benjamin Herrenschmidt , Thomas Gleixner , Grant Likely , Ingo Molnar , "H. Peter Anvin" , "Rafael J. Wysocki" , Bjorn Helgaas , Randy Dunlap , Yinghai Lu , x86@kernel.org, Jiang Liu Cc: Konrad Rzeszutek Wilk , Andrew Morton , Tony Luck , Joerg Roedel , Paul Gortmaker , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Ingo Molnar Subject: [Patch V4 37/42] x86, irq: introduce helper functions to release IOAPIC pin Date: Mon, 9 Jun 2014 16:20:06 +0800 Message-Id: <1402302011-23642-38-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1402302011-23642-1-git-send-email-jiang.liu@linux.intel.com> References: <1402302011-23642-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce function mp_unmap_irq() to release IOAPIC IRQ when IRQ is not used any more, which will typically called by pcibios_disabled_irq. And function mp_irqdomain_unmap() is a common implementation of irq_domain_ops.unmap for IOAPIC. Signed-off-by: Jiang Liu --- arch/x86/include/asm/io_apic.h | 3 ++ arch/x86/kernel/apic/io_apic.c | 61 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h index af6f9d4309bf..0aeed5ca356e 100644 --- a/arch/x86/include/asm/io_apic.h +++ b/arch/x86/include/asm/io_apic.h @@ -187,10 +187,12 @@ extern int mp_find_ioapic(u32 gsi); extern int mp_find_ioapic_pin(int ioapic, u32 gsi); extern u32 mp_pin_to_gsi(int ioapic, int pin); extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags); +extern void mp_unmap_irq(int irq); extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base, struct ioapic_domain_cfg *cfg); 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); extern int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node); extern void __init pre_init_apic_IRQ0(void); @@ -234,6 +236,7 @@ static inline void ioapic_insert_resources(void) { } static inline int mp_find_ioapic(u32 gsi) { return 0; } static inline u32 mp_pin_to_gsi(int ioapic, int pin) { return UINT_MAX; } static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags) { return gsi; } +static inline void mp_unmap_irq(int irq) { } static inline int save_ioapic_entries(void) { diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 5fc76cf51e44..60555354b331 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -467,6 +467,21 @@ static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pi return 0; } +static void __remove_pin_from_irq(struct irq_cfg *cfg, int apic, int pin) +{ + struct irq_pin_list **last, *entry; + + last = &cfg->irq_2_pin; + for_each_irq_pin(entry, cfg->irq_2_pin) + if (entry->apic == apic && entry->pin == pin) { + *last = entry->next; + kfree(entry); + return; + } else { + last = &entry->next; + } +} + static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin) { if (__add_pin_to_irq_node(cfg, node, apic, pin)) @@ -1119,6 +1134,31 @@ int mp_map_gsi_to_irq(u32 gsi, unsigned int flags) return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags); } +void mp_unmap_irq(int irq) +{ + struct irq_data *data = irq_get_irq_data(irq); + struct mp_pin_info *info; + int ioapic, pin; + + if (!data || !data->domain) + return; + + ioapic = (int)(long)data->domain->host_data; + pin = (int)data->hwirq; + info = mp_pin_info(ioapic, pin); + + mutex_lock(&ioapic_mutex); + if (--info->count == 0) { + info->set = 0; + if (irq < nr_legacy_irqs() && + ioapics[ioapic].irqdomain_cfg.type == IOAPIC_DOMAIN_LEGACY) + mp_irqdomain_unmap(data->domain, irq); + else + irq_dispose_mapping(irq); + } + mutex_unlock(&ioapic_mutex); +} + /* * Find a specific PCI IRQ entry. * Not an __init, possibly needed by modules @@ -3874,6 +3914,27 @@ int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq, return io_apic_setup_irq_pin(virq, info->node, &attr); } +void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq) +{ + struct irq_data *data = irq_get_irq_data(virq); + struct irq_cfg *cfg = irq_cfg(virq); + int ioapic = (int)(long)domain->host_data; + int pin = (int)data->hwirq; + + /* + * Skip the timer IRQ if there's a quirk handler installed and if it + * returns 1: + */ + if (apic->multi_timer_check && + apic->multi_timer_check(ioapic, virq)) + return; + + ioapic_mask_entry(ioapic, pin); + __remove_pin_from_irq(cfg, ioapic, pin); + WARN_ON(cfg->irq_2_pin != NULL); + arch_teardown_hwirq(virq); +} + int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node) { int ret = 0; -- 1.7.10.4 -- 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/