linux-kernel - [PATCH 1/2] iommu-api: Introduce iommu

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Date:	Thu, 23 Jun 2011 17:31:22 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	<iommu@...ts.linux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Brown <davidb@...eaurora.org>, <kvm@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/2] iommu-api: Introduce iommu_comit function

This function will be used to coalesce cache-flushes
required after a domain was changed. This should
significantly improve performance in some cases.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 drivers/iommu/iommu.c |    7 +++++++
 include/linux/iommu.h |    6 ++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6e6b6a1..4099cc6 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -122,3 +122,10 @@ int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
 	return iommu_ops->unmap(domain, iova, gfp_order);
 }
 EXPORT_SYMBOL_GPL(iommu_unmap);
+
+void iommu_commit(struct iommu_domain *domain)
+{
+	if (iommu_ops->commit)
+		iommu_ops->commit(domain);
+}
+EXPORT_SYMBOL_GPL(iommu_commit);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 9940319..dbb4324 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -47,6 +47,7 @@ struct iommu_ops {
 				    unsigned long iova);
 	int (*domain_has_cap)(struct iommu_domain *domain,
 			      unsigned long cap);
+	void (*commit)(struct iommu_domain *domain);
 };
 
 #ifdef CONFIG_IOMMU_API
@@ -67,6 +68,7 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 				      unsigned long iova);
 extern int iommu_domain_has_cap(struct iommu_domain *domain,
 				unsigned long cap);
+extern void iommu_commit(struct iommu_domain *domain);
 
 #else /* CONFIG_IOMMU_API */
 
@@ -123,6 +125,10 @@ static inline int domain_has_cap(struct iommu_domain *domain,
 	return 0;
 }
 
+static inline void iommu_commit(struct iommu_domain *domain)
+{
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 #endif /* __LINUX_IOMMU_H */
-- 
1.7.4.1


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