Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932493AbbFEFws (ORCPT ); Fri, 5 Jun 2015 01:52:48 -0400 Received: from mga02.intel.com ([134.134.136.20]:33935 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932368AbbFEFwc (ORCPT ); Fri, 5 Jun 2015 01:52:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,556,1427785200"; d="scan'208";a="705724148" From: Feng Wu To: joro@8bytes.org, dwmw2@infradead.org, tglx@linutronix.de Cc: jiang.liu@linux.intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Feng Wu Subject: [v9 8/9] iommu, x86: define irq_remapping_cap() Date: Fri, 5 Jun 2015 13:42:53 +0800 Message-Id: <1433482974-14614-9-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1433482974-14614-1-git-send-email-feng.wu@intel.com> References: <1433482974-14614-1-git-send-email-feng.wu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2029 Lines: 60 This patch adds a new interface irq_remapping_cap() to detect whether irq remapping supports new features, such as VT-d Posted-Interrupts. We export this function out, so that KVM code can check this and use this mechanism properly. Signed-off-by: Feng Wu Reviewed-by: Jiang Liu --- arch/x86/include/asm/irq_remapping.h | 2 ++ drivers/iommu/irq_remapping.c | 9 +++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h index 202e040..61aa8ad 100644 --- a/arch/x86/include/asm/irq_remapping.h +++ b/arch/x86/include/asm/irq_remapping.h @@ -35,6 +35,7 @@ enum irq_remap_cap { IRQ_POSTING_CAP = 0, }; +extern bool irq_remapping_cap(enum irq_remap_cap cap); extern void set_irq_remapping_broken(void); extern int irq_remapping_prepare(void); extern int irq_remapping_enable(void); @@ -64,6 +65,7 @@ struct vcpu_data { #else /* CONFIG_IRQ_REMAP */ +static bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; } static inline void set_irq_remapping_broken(void) { } static inline int irq_remapping_prepare(void) { return -ENODEV; } static inline int irq_remapping_enable(void) { return -ENODEV; } diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index ed605a9..2d99930 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -81,6 +81,15 @@ void set_irq_remapping_broken(void) irq_remap_broken = 1; } +bool irq_remapping_cap(enum irq_remap_cap cap) +{ + if (!remap_ops || disable_irq_post) + return 0; + + return (remap_ops->capability & (1 << cap)); +} +EXPORT_SYMBOL_GPL(irq_remapping_cap); + int __init irq_remapping_prepare(void) { if (disable_irq_remap) -- 2.1.0 -- 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/