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Message-Id: <1432098937-19527-7-git-send-email-feng.wu@intel.com>
Date:	Wed, 20 May 2015 13:15:34 +0800
From:	Feng Wu <feng.wu@...el.com>
To:	joro@...tes.org, dwmw2@...radead.org
Cc:	tglx@...utronix.de, jiang.liu@...ux.intel.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Feng Wu <feng.wu@...el.com>
Subject: [v5 6/9] iommu, x86: Add cap_pi_support() to detect VT-d PI capability

Add helper function to detect VT-d Posted-Interrupts capability.

Signed-off-by: Feng Wu <feng.wu@...el.com>
Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>
Acked-by: David Woodhouse <David.Woodhouse@...el.com>
---
 include/linux/intel-iommu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 0af9b03..0c251be 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -87,6 +87,7 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 /*
  * Decoding Capability Register
  */
+#define cap_pi_support(c)	(((c) >> 59) & 1)
 #define cap_read_drain(c)	(((c) >> 55) & 1)
 #define cap_write_drain(c)	(((c) >> 54) & 1)
 #define cap_max_amask_val(c)	(((c) >> 48) & 0x3f)
-- 
2.1.0

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