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diff --git a/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h b/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/dma-buf-map.h
@@ -0,0 +1,91 @@
+/* Public domain. */
+
+#ifndef _LINUX_DMA_BUF_MAP_H
+#define _LINUX_DMA_BUF_MAP_H
+
+#include <linux/io.h>
+#include <linux/string.h>
+
+struct dma_buf_map {
+ union {
+ void *vaddr_iomem;
+ void *vaddr;
+ };
+ bool is_iomem;
+};
+
+static inline void
+dma_buf_map_incr(struct dma_buf_map *dbm, size_t n)
+{
+ if (dbm->is_iomem)
+ dbm->vaddr_iomem += n;
+ else
+ dbm->vaddr += n;
+}
+
+static inline void
+dma_buf_map_memcpy_to(struct dma_buf_map *dbm, const void *src, size_t len)
+{
+ if (dbm->is_iomem)
+ memcpy_toio(dbm->vaddr_iomem, src, len);
+ else
+ memcpy(dbm->vaddr, src, len);
+}
+
+static inline bool
+dma_buf_map_is_null(const struct dma_buf_map *dbm)
+{
+ if (dbm->is_iomem)
+ return (dbm->vaddr_iomem == NULL);
+ else
+ return (dbm->vaddr == NULL);
+}
+
+static inline bool
+dma_buf_map_is_set(const struct dma_buf_map *dbm)
+{
+ if (dbm->is_iomem)
+ return (dbm->vaddr_iomem != NULL);
+ else
+ return (dbm->vaddr != NULL);
+}
+
+static inline bool
+dma_buf_map_is_equal(
+ const struct dma_buf_map *dbm_a, const struct dma_buf_map *dbm_b)
+{
+ if (dbm_a->is_iomem != dbm_b->is_iomem)
+ return (false);
+
+ if (dbm_a->is_iomem)
+ return (dbm_a->vaddr_iomem == dbm_b->vaddr_iomem);
+ else
+ return (dbm_a->vaddr == dbm_b->vaddr);
+}
+
+static inline void
+dma_buf_map_clear(struct dma_buf_map *dbm)
+{
+ if (dbm->is_iomem) {
+ dbm->vaddr_iomem = NULL;
+ dbm->is_iomem = false;
+ } else {
+ dbm->vaddr = NULL;
+ }
+}
+
+static inline void
+dma_buf_map_set_vaddr_iomem(struct dma_buf_map *dbm, void *addr)
+{
+ dbm->vaddr_iomem = addr;
+ dbm->is_iomem = true;
+}
+
+static inline void
+dma_buf_map_set_vaddr(struct dma_buf_map *dbm, void *addr)
+{
+ dbm->vaddr = addr;
+ dbm->is_iomem = false;
+}
+
+#endif

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