[PATCH v2 2/9] iommu: Add dummy dev_iommu_fwspec_get() helper

[Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

From: Thierry Reding <treding@nvidia.com>

This dummy implementation is useful to avoid a dependency on the
IOMMU_API Kconfig symbol in drivers that can optionally use the IOMMU
API.

In order to fully use this, also move the struct iommu_fwspec definition
out of the IOMMU_API protected region.

Suggested-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 include/linux/iommu.h | 47 ++++++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7bf038b371b8..b092e73b2c86 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -190,6 +190,27 @@ struct iommu_sva_ops {
 	iommu_mm_exit_handler_t mm_exit;
 };
 
+/**
+ * struct iommu_fwspec - per-device IOMMU instance data
+ * @ops: ops for this device's IOMMU
+ * @iommu_fwnode: firmware handle for this device's IOMMU
+ * @iommu_priv: IOMMU driver private data for this device
+ * @flags: IOMMU flags associated with this device
+ * @num_ids: number of associated device IDs
+ * @ids: IDs which this device may present to the IOMMU
+ */
+struct iommu_fwspec {
+	const struct iommu_ops	*ops;
+	struct fwnode_handle	*iommu_fwnode;
+	void			*iommu_priv;
+	u32			flags;
+	unsigned int		num_ids;
+	u32			ids[1];
+};
+
+/* ATS is supported */
+#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)
+
 #ifdef CONFIG_IOMMU_API
 
 /**
@@ -565,27 +586,6 @@ extern struct iommu_group *generic_device_group(struct device *dev);
 /* FSL-MC device grouping function */
 struct iommu_group *fsl_mc_device_group(struct device *dev);
 
-/**
- * struct iommu_fwspec - per-device IOMMU instance data
- * @ops: ops for this device's IOMMU
- * @iommu_fwnode: firmware handle for this device's IOMMU
- * @iommu_priv: IOMMU driver private data for this device
- * @flags: IOMMU flags associated with this device
- * @num_ids: number of associated device IDs
- * @ids: IDs which this device may present to the IOMMU
- */
-struct iommu_fwspec {
-	const struct iommu_ops	*ops;
-	struct fwnode_handle	*iommu_fwnode;
-	void			*iommu_priv;
-	u32			flags;
-	unsigned int		num_ids;
-	u32			ids[1];
-};
-
-/* ATS is supported */
-#define IOMMU_FWSPEC_PCI_RC_ATS			(1 << 0)
-
 /**
  * struct iommu_sva - handle to a device-mm bond
  */
@@ -980,6 +980,11 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
 	return NULL;
 }
 
+static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
+{
+	return NULL;
+}
+
 static inline bool
 iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
 {
-- 
2.23.0

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