1 files changed, 109 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
new file mode 100644
index 000000000..5d2dbe7e0
--- /dev/null
+++ b/include/linux/swiotlb.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_SWIOTLB_H
+#define __LINUX_SWIOTLB_H
+
+#include <linux/dma-direction.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/limits.h>
+
+struct device;
+struct page;
+struct scatterlist;
+
+enum swiotlb_force {
+	SWIOTLB_NORMAL,		/* Default - depending on HW DMA mask etc. */
+	SWIOTLB_FORCE,		/* swiotlb=force */
+	SWIOTLB_NO_FORCE,	/* swiotlb=noforce */
+};
+
+/*
+ * Maximum allowable number of contiguous slabs to map,
+ * must be a power of 2.  What is the appropriate value ?
+ * The complexity of {map,unmap}_single is linearly dependent on this value.
+ */
+#define IO_TLB_SEGSIZE	128
+
+/*
+ * log of the size of each IO TLB slab.  The number of slabs is command line
+ * controllable.
+ */
+#define IO_TLB_SHIFT 11
+#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
+
+extern void swiotlb_init(int verbose);
+int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
+extern unsigned long swiotlb_nr_tbl(void);
+unsigned long swiotlb_size_or_default(void);
+extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
+extern int swiotlb_late_init_with_default_size(size_t default_size);
+extern void __init swiotlb_update_mem_attributes(void);
+
+/*
+ * Enumeration for sync targets
+ */
+enum dma_sync_target {
+	SYNC_FOR_CPU = 0,
+	SYNC_FOR_DEVICE = 1,
+};
+
+phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
+		size_t mapping_size, size_t alloc_size,
+		enum dma_data_direction dir, unsigned long attrs);
+
+extern void swiotlb_tbl_unmap_single(struct device *hwdev,
+				     phys_addr_t tlb_addr,
+				     size_t mapping_size,
+				     size_t alloc_size,
+				     enum dma_data_direction dir,
+				     unsigned long attrs);
+
+extern void swiotlb_tbl_sync_single(struct device *hwdev,
+				    phys_addr_t tlb_addr,
+				    size_t size, enum dma_data_direction dir,
+				    enum dma_sync_target target);
+
+dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
+		size_t size, enum dma_data_direction dir, unsigned long attrs);
+
+#ifdef CONFIG_SWIOTLB
+extern enum swiotlb_force swiotlb_force;
+extern phys_addr_t io_tlb_start, io_tlb_end;
+
+static inline bool is_swiotlb_buffer(phys_addr_t paddr)
+{
+	return paddr >= io_tlb_start && paddr < io_tlb_end;
+}
+
+void __init swiotlb_exit(void);
+unsigned int swiotlb_max_segment(void);
+size_t swiotlb_max_mapping_size(struct device *dev);
+bool is_swiotlb_active(void);
+#else
+#define swiotlb_force SWIOTLB_NO_FORCE
+static inline bool is_swiotlb_buffer(phys_addr_t paddr)
+{
+	return false;
+}
+static inline void swiotlb_exit(void)
+{
+}
+static inline unsigned int swiotlb_max_segment(void)
+{
+	return 0;
+}
+static inline size_t swiotlb_max_mapping_size(struct device *dev)
+{
+	return SIZE_MAX;
+}
+
+static inline bool is_swiotlb_active(void)
+{
+	return false;
+}
+#endif /* CONFIG_SWIOTLB */
+
+extern void swiotlb_print_info(void);
+extern void swiotlb_set_max_segment(unsigned int);
+
+#endif /* __LINUX_SWIOTLB_H */