[PATCH v2 03/04] iommu/ipmmu-vmsa: Break out 32-bit ARM mapping code

[Magnus Damm]

From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>

Make the driver compile on more than just 32-bit ARM
by breaking out and wrapping ARM specific functions
in #ifdefs. Not pretty, but needed to be able to use
the driver on other architectures like ARM64.

Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
---

 Changes since V1:
 - Rebased to work without patch 2 and 3 from V1 series

 drivers/iommu/ipmmu-vmsa.c |   94 +++++++++++++++++++++++++++++---------------
 1 file changed, 62 insertions(+), 32 deletions(-)

--- 0004/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c	2016-03-15 12:25:45.040513000 +0900
@@ -22,8 +22,10 @@
 #include <linux/sizes.h>
 #include <linux/slab.h>
 
+#ifdef CONFIG_ARM
 #include <asm/dma-iommu.h>
 #include <asm/pgalloc.h>
+#endif
 
 #include "io-pgtable.h"
 
@@ -38,7 +40,9 @@ struct ipmmu_vmsa_device {
 	DECLARE_BITMAP(ctx, IPMMU_CTX_MAX);
 	struct ipmmu_vmsa_domain *domains[IPMMU_CTX_MAX];
 
+#ifdef CONFIG_ARM
 	struct dma_iommu_mapping *mapping;
+#endif
 };
 
 struct ipmmu_vmsa_domain {
@@ -615,6 +619,60 @@ static int ipmmu_find_utlbs(struct ipmmu
 	return 0;
 }
 
+#ifdef CONFIG_ARM
+static int ipmmu_map_attach(struct device *dev, struct ipmmu_vmsa_device *mmu)
+{
+	int ret;
+
+	/*
+	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
+	 * VAs. This will allocate a corresponding IOMMU domain.
+	 *
+	 * TODO:
+	 * - Create one mapping per context (TLB).
+	 * - Make the mapping size configurable ? We currently use a 2GB mapping
+	 *   at a 1GB offset to ensure that NULL VAs will fault.
+	 */
+	if (!mmu->mapping) {
+		struct dma_iommu_mapping *mapping;
+
+		mapping = arm_iommu_create_mapping(&platform_bus_type,
+						   SZ_1G, SZ_2G);
+		if (IS_ERR(mapping)) {
+			dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
+			return PTR_ERR(mapping);
+		}
+
+		mmu->mapping = mapping;
+	}
+
+	/* Attach the ARM VA mapping to the device. */
+	ret = arm_iommu_attach_device(dev, mmu->mapping);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach device to VA mapping\n");
+		arm_iommu_release_mapping(mmu->mapping);
+	}
+
+	return ret;
+}
+static inline void ipmmu_detach(struct device *dev)
+{
+	arm_iommu_detach_device(dev);
+}
+static inline void ipmmu_release_mapping(struct ipmmu_vmsa_device *mmu)
+{
+	arm_iommu_release_mapping(mmu->mapping);
+}
+#else
+static inline int ipmmu_map_attach(struct device *dev,
+				   struct ipmmu_vmsa_device *mmu)
+{
+	return 0;
+}
+static inline void ipmmu_detach(struct device *dev) {}
+static inline void ipmmu_release_mapping(struct ipmmu_vmsa_device *mmu) {}
+#endif
+
 static int ipmmu_add_device(struct device *dev)
 {
 	struct ipmmu_vmsa_archdata *archdata;
@@ -695,41 +753,13 @@ static int ipmmu_add_device(struct devic
 	archdata->num_utlbs = num_utlbs;
 	dev->archdata.iommu = archdata;
 
-	/*
-	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
-	 * VAs. This will allocate a corresponding IOMMU domain.
-	 *
-	 * TODO:
-	 * - Create one mapping per context (TLB).
-	 * - Make the mapping size configurable ? We currently use a 2GB mapping
-	 *   at a 1GB offset to ensure that NULL VAs will fault.
-	 */
-	if (!mmu->mapping) {
-		struct dma_iommu_mapping *mapping;
-
-		mapping = arm_iommu_create_mapping(&platform_bus_type,
-						   SZ_1G, SZ_2G);
-		if (IS_ERR(mapping)) {
-			dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
-			ret = PTR_ERR(mapping);
-			goto error;
-		}
-
-		mmu->mapping = mapping;
-	}
-
-	/* Attach the ARM VA mapping to the device. */
-	ret = arm_iommu_attach_device(dev, mmu->mapping);
-	if (ret < 0) {
-		dev_err(dev, "Failed to attach device to VA mapping\n");
+	ret = ipmmu_map_attach(dev, mmu);
+	if (ret < 0)
 		goto error;
-	}
 
 	return 0;
 
 error:
-	arm_iommu_release_mapping(mmu->mapping);
-
 	kfree(dev->archdata.iommu);
 	kfree(utlbs);
 
@@ -745,7 +775,7 @@ static void ipmmu_remove_device(struct d
 {
 	struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
 
-	arm_iommu_detach_device(dev);
+	ipmmu_detach(dev);
 	iommu_group_remove_device(dev);
 
 	kfree(archdata->utlbs);
@@ -856,7 +886,7 @@ static int ipmmu_remove(struct platform_
 	list_del(&mmu->list);
 	spin_unlock(&ipmmu_devices_lock);
 
-	arm_iommu_release_mapping(mmu->mapping);
+	ipmmu_release_mapping(mmu);
 
 	ipmmu_device_reset(mmu);