Commit-ID: 1aa9f1afb6814105c9a0b6b17487533fadc0c763
Gitweb: http://git.kernel.org/tip/1aa9f1afb6814105c9a0b6b17487533fadc0c763
Author: Feng Wu <feng.wu@xxxxxxxxx>
AuthorDate: Fri, 5 Jun 2015 13:42:53 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 8 Jun 2015 15:41:33 +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@xxxxxxxxx>
Reviewed-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Acked-by: Joerg Roedel <joro@xxxxxxxxxx>
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: dwmw2@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1433482974-14614-9-git-send-email-feng.wu@xxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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)
--
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