[RFC PATCH 1/4] iommu/vt-d: Move domain_flush_cache helper into header

[Lu Baolu <baolu.lu@linux.intel.com>]

So that it could be used in other source files as well.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/intel-iommu.c | 7 -------
 include/linux/intel-iommu.h | 7 +++++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 5aa68a094efd..9cfe8098d993 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -828,13 +828,6 @@ static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devf
 	return iommu;
 }
 
-static void domain_flush_cache(struct dmar_domain *domain,
-			       void *addr, int size)
-{
-	if (!domain->iommu_coherency)
-		clflush_cache_range(addr, size);
-}
-
 static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn)
 {
 	struct context_entry *context;
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index ed11ef594378..3ee694d4f361 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -629,6 +629,13 @@ static inline int first_pte_in_page(struct dma_pte *pte)
 	return !((unsigned long)pte & ~VTD_PAGE_MASK);
 }
 
+static inline void
+domain_flush_cache(struct dmar_domain *domain, void *addr, int size)
+{
+	if (!domain->iommu_coherency)
+		clflush_cache_range(addr, size);
+}
+
 extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
 extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);
 
-- 
2.17.1