[tip:x86/apic] iommu, x86: Add cap_pi_support() to detect VT-d PI capability

[tip-bot for Feng Wu <tipbot@zytor.com>]

Commit-ID:  948f4ea26d44a64e315225299155af82e213ebed
Gitweb:     http://git.kernel.org/tip/948f4ea26d44a64e315225299155af82e213ebed
Author:     Feng Wu <feng.wu@intel.com>
AuthorDate: Fri, 5 Jun 2015 13:42:51 +0800
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 8 Jun 2015 15:41:32 +0200

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@intel.com>
Reviewed-by: Jiang Liu <jiang.liu@linux.intel.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/1433482974-14614-7-git-send-email-feng.wu@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 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)