From 1a0730d6649113c820217387a011a17dd4aff3ad Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 11 Oct 2010 11:55:37 +0200
Subject: x86: Speed up the irq_remapped check in hot pathes
irq_2_iommu is in struct irq_cfg, so we can do the irq_remapped check
based on irq_cfg instead of going through a lookup function. That's
especially interesting in the eoi_ioapic_irq() hotpath.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
---
arch/x86/include/asm/irq_remapping.h | 8 ++++++++
1 file changed, 8 insertions(+)
(limited to 'arch/x86/include/asm')
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 8d841505344..1c23360fb2d 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -24,10 +24,18 @@ static inline void prepare_irte(struct irte *irte, int vector,
irte->dest_id = IRTE_DEST(dest);
irte->redir_hint = 1;
}
+static inline bool irq_remapped(struct irq_cfg *cfg)
+{
+ return cfg->irq_2_iommu.iommu != NULL;
+}
#else
static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
{
}
+static inline bool irq_remapped(struct irq_cfg *cfg)
+{
+ return false;
+}
#endif
#endif /* _ASM_X86_IRQ_REMAPPING_H */
--
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