Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753649Ab3HKCxz (ORCPT ); Sat, 10 Aug 2013 22:53:55 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:34820 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753299Ab3HKCtK (ORCPT ); Sat, 10 Aug 2013 22:49:10 -0400 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Tony Luck , Bjorn Helgaas , "Rafael J. Wysocki" Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Yinghai Lu , Joerg Roedel , Konrad Rzeszutek Wilk , Sebastian Andrzej Siewior Subject: [PATCH v4 13/28] x86, irq: Add alloc_reserved_irq_and_cfg_at() Date: Sat, 10 Aug 2013 19:47:59 -0700 Message-Id: <1376189294-32022-14-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1376189294-32022-1-git-send-email-yinghai@kernel.org> References: <1376189294-32022-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2410 Lines: 79 For ioapic hot-add support, it would be easy if we have continuous irq numbers for new added ioapic controller. We can reserve irq range at first, then allocate those pre-reserved one when it is needed. Add alloc_reserved_irq_and_cfg_at() to really allocate irq_desc and cfg, because pre-reserved only mark bits in allocate_irqs bit maps. Also fallback to alloc_irq_and_cfg_at(), and it is needed as we do not actually reserved irq for io apic irq yet. This patch is x86 arch code. -v2: update changelog by adding reasons, requested by Konrad. -v3: according to tglx, separate to another patch, and use alloc_reserved_... instead of realloc_... also add handling for one possible path in alloc_reserved_irq_and_cfg_at(). Signed-off-by: Yinghai Lu Cc: Joerg Roedel Cc: Konrad Rzeszutek Wilk Cc: Sebastian Andrzej Siewior --- arch/x86/kernel/apic/io_apic.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index ef2d530..c883da9 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -301,6 +301,29 @@ static void free_irq_at(unsigned int at, struct irq_cfg *cfg) irq_free_desc(at); } +static struct irq_cfg *alloc_reserved_irq_and_cfg_at(unsigned int at, int node) +{ + struct irq_cfg *cfg; + int res; + + res = irq_alloc_reserved_desc_at(at, node); + + if (res >= 0) { + cfg = irq_desc_get_chip_data(irq_to_desc(at)); + if (cfg) + return cfg; + + cfg = alloc_irq_cfg(at, node); + if (cfg) + irq_set_chip_data(at, cfg); + else + irq_free_desc(at); + + return cfg; + } + + return alloc_irq_and_cfg_at(at, node); +} struct io_apic { unsigned int index; @@ -3352,7 +3375,7 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) static int io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr) { - struct irq_cfg *cfg = alloc_irq_and_cfg_at(irq, node); + struct irq_cfg *cfg = alloc_reserved_irq_and_cfg_at(irq, node); int ret; if (!cfg) -- 1.8.1.4 -- 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/