linux-kernel - [PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

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Message-Id: <1414433155-31600-2-git-send-email-a.motakis@virtualopensystems.com>
Date:	Mon, 27 Oct 2014 19:05:50 +0100
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
	alex.williamson@...hat.com
Cc:	will.deacon@....com, tech@...tualopensystems.com,
	christoffer.dall@...aro.org, eric.auger@...aro.org,
	kim.phillips@...escale.com, marc.zyngier@....com,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	kvm@...r.kernel.org (open list:VFIO DRIVER),
	linux-api@...r.kernel.org (open list:ABI/API),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

Currently a VFIO driver's IOMMU capabilities are encoded as a series of
numerical defines. Replace this with an enum for future maintainability.

Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
---
 include/uapi/linux/vfio.h | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 6612974..1e39842 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -19,19 +19,18 @@
 
 /* Kernel & User level defines for VFIO IOCTLs. */
 
-/* Extensions */
-
-#define VFIO_TYPE1_IOMMU		1
-#define VFIO_SPAPR_TCE_IOMMU		2
-#define VFIO_TYPE1v2_IOMMU		3
 /*
- * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping).  This
- * capability is subject to change as groups are added or removed.
+ * Capabilities exposed by the VFIO IOMMU driver. Some capabilities are subject
+ * to change as groups are added or removed.
  */
-#define VFIO_DMA_CC_IOMMU		4
-
-/* Check if EEH is supported */
-#define VFIO_EEH			5
+enum vfio_iommu_cap {
+	VFIO_TYPE1_IOMMU	= 1,
+	VFIO_SPAPR_TCE_IOMMU	= 2,
+	VFIO_TYPE1v2_IOMMU	= 3,
+	VFIO_DMA_CC_IOMMU	= 4, /* IOMMU enforces DMA cache coherence
+					(ex. PCIe NoSnoop stripping) */
+	VFIO_EEH		= 5, /* Check if EEH is supported */
+};
 
 /*
  * The IOCTL interface is designed for extensibility by embedding the
-- 
2.1.1

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