Commit-ID: 1aa9f1afb6814105c9a0b6b17487533fadc0c763 Gitweb: http://git.kernel.org/tip/1aa9f1afb6814105c9a0b6b17487533fadc0c763 Author: Feng Wu <feng...@intel.com> AuthorDate: Fri, 5 Jun 2015 13:42:53 +0800 Committer: Thomas Gleixner <t...@linutronix.de> 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...@intel.com> Reviewed-by: Jiang Liu <jiang....@linux.intel.com> Acked-by: Joerg Roedel <j...@8bytes.org> Cc: io...@lists.linux-foundation.org Cc: dw...@infradead.org Link: http://lkml.kernel.org/r/1433482974-14614-9-git-send-email-feng...@intel.com Signed-off-by: Thomas Gleixner <t...@linutronix.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 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
