1 files changed, 82 insertions, 0 deletions
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
new file mode 100644
index 000000000..2112f21f7
--- /dev/null
+++ b/include/linux/dma-iommu.h
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2014-2015 ARM Ltd.
+ */
+#ifndef __DMA_IOMMU_H
+#define __DMA_IOMMU_H
+
+#include <linux/errno.h>
+#include <linux/types.h>
+
+#ifdef CONFIG_IOMMU_DMA
+#include <linux/dma-mapping.h>
+#include <linux/iommu.h>
+#include <linux/msi.h>
+
+/* Domain management interface for IOMMU drivers */
+int iommu_get_dma_cookie(struct iommu_domain *domain);
+int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
+void iommu_put_dma_cookie(struct iommu_domain *domain);
+
+/* Setup call for arch DMA mapping code */
+void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size);
+
+/* The DMA API isn't _quite_ the whole story, though... */
+/*
+ * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
+ *
+ * The MSI page will be stored in @desc.
+ *
+ * Return: 0 on success otherwise an error describing the failure.
+ */
+int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
+
+/* Update the MSI message if required. */
+void iommu_dma_compose_msi_msg(struct msi_desc *desc,
+			       struct msi_msg *msg);
+
+void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
+
+#else /* CONFIG_IOMMU_DMA */
+
+struct iommu_domain;
+struct msi_desc;
+struct msi_msg;
+struct device;
+
+static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
+		u64 size)
+{
+}
+
+static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
+{
+	return -ENODEV;
+}
+
+static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
+{
+	return -ENODEV;
+}
+
+static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
+{
+}
+
+static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
+					phys_addr_t msi_addr)
+{
+	return 0;
+}
+
+static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
+					     struct msi_msg *msg)
+{
+}
+
+static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
+{
+}
+
+#endif	/* CONFIG_IOMMU_DMA */
+#endif	/* __DMA_IOMMU_H */