linux-kernel - [tip:x86/apic] iommu, x86: Provide irq_remapping

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Message-ID: <tip-959c870f7305be019d9316bc4e038dc6119d51ad@git.kernel.org>
Date:	Fri, 12 Jun 2015 02:51:00 -0700
From:	tip-bot for Feng Wu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...or.com,
	feng.wu@...el.com, jiang.liu@...ux.intel.com, joro@...tes.org,
	tglx@...utronix.de
Subject: [tip:x86/apic] iommu, x86: Provide irq_remapping_cap() interface

Commit-ID:  959c870f7305be019d9316bc4e038dc6119d51ad
Gitweb:     http://git.kernel.org/tip/959c870f7305be019d9316bc4e038dc6119d51ad
Author:     Feng Wu <feng.wu@...el.com>
AuthorDate: Tue, 9 Jun 2015 13:20:36 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 12 Jun 2015 11:33:52 +0200

iommu, x86: Provide irq_remapping_cap() interface

Add a new interface irq_remapping_cap() to detect whether irq
remapping supports new features, such as VT-d Posted-Interrupts.

Export the function, so that KVM code can check this and use this
mechanism properly.

Signed-off-by: Feng Wu <feng.wu@...el.com>
Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Joerg Roedel <joro@...tes.org>
Cc: iommu@...ts.linux-foundation.org
Cc: dwmw2@...radead.org
Link: http://lkml.kernel.org/r/1433827237-3382-10-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 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 e479fbd..046c7fb 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 {
 
 #ifdef CONFIG_IRQ_REMAP
 
+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 inline 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)
--
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