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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/swiotlb.h
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@@ -5,6 +5,7 @@
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 #include <linux/dma-direction.h>
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 #include <linux/init.h>
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 #include <linux/types.h>
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+#include <linux/limits.h>
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 struct device;
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 struct page;
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@@ -15,8 +16,6 @@
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 	SWIOTLB_FORCE,		/* swiotlb=force */
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 	SWIOTLB_NO_FORCE,	/* swiotlb=noforce */
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 };
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-
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-extern enum swiotlb_force swiotlb_force;
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 /*
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  * Maximum allowable number of contiguous slabs to map,
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@@ -30,12 +29,14 @@
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  * controllable.
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  */
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 #define IO_TLB_SHIFT 11
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+#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
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 extern void swiotlb_init(int verbose);
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 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
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 extern unsigned long swiotlb_nr_tbl(void);
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 unsigned long swiotlb_size_or_default(void);
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 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
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+extern int swiotlb_late_init_with_default_size(size_t default_size);
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 extern void __init swiotlb_update_mem_attributes(void);
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 /*
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@@ -46,18 +47,15 @@
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 	SYNC_FOR_DEVICE = 1,
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 };
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-/* define the last possible byte of physical address space as a mapping error */
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-#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
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-
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-extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
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-					  dma_addr_t tbl_dma_addr,
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-					  phys_addr_t phys, size_t size,
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-					  enum dma_data_direction dir,
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-					  unsigned long attrs);
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+phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
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+		size_t mapping_size, size_t alloc_size,
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+		enum dma_data_direction dir, unsigned long attrs);
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 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
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 				     phys_addr_t tlb_addr,
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-				     size_t size, enum dma_data_direction dir,
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+				     size_t mapping_size,
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+				     size_t alloc_size,
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+				     enum dma_data_direction dir,
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 				     unsigned long attrs);
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 extern void swiotlb_tbl_sync_single(struct device *hwdev,
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@@ -65,65 +63,47 @@
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 				    size_t size, enum dma_data_direction dir,
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 				    enum dma_sync_target target);
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65
 
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-/* Accessory functions. */
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-
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-void *swiotlb_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
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-		gfp_t flags, unsigned long attrs);
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-void swiotlb_free(struct device *dev, size_t size, void *vaddr,
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-		dma_addr_t dma_addr, unsigned long attrs);
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-
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-extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
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-				   unsigned long offset, size_t size,
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-				   enum dma_data_direction dir,
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-				   unsigned long attrs);
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-extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
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-			       size_t size, enum dma_data_direction dir,
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-			       unsigned long attrs);
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-
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-extern int
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-swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
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-		     enum dma_data_direction dir,
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-		     unsigned long attrs);
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-
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-extern void
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-swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
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-		       int nelems, enum dma_data_direction dir,
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-		       unsigned long attrs);
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-
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-extern void
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-swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
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-			    size_t size, enum dma_data_direction dir);
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-
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-extern void
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-swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
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-			int nelems, enum dma_data_direction dir);
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-
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-extern void
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-swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
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-			       size_t size, enum dma_data_direction dir);
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-
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-extern void
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-swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
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-			   int nelems, enum dma_data_direction dir);
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-
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-extern int
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-swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
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-
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-extern int
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-swiotlb_dma_supported(struct device *hwdev, u64 mask);
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+dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
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+		size_t size, enum dma_data_direction dir, unsigned long attrs);
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 #ifdef CONFIG_SWIOTLB
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-extern void __init swiotlb_exit(void);
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+extern enum swiotlb_force swiotlb_force;
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+extern phys_addr_t io_tlb_start, io_tlb_end;
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+
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+static inline bool is_swiotlb_buffer(phys_addr_t paddr)
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+{
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+	return paddr >= io_tlb_start && paddr < io_tlb_end;
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+}
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+
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+void __init swiotlb_exit(void);
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 unsigned int swiotlb_max_segment(void);
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+size_t swiotlb_max_mapping_size(struct device *dev);
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+bool is_swiotlb_active(void);
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 #else
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-static inline void swiotlb_exit(void) { }
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-static inline unsigned int swiotlb_max_segment(void) { return 0; }
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-#endif
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+#define swiotlb_force SWIOTLB_NO_FORCE
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+static inline bool is_swiotlb_buffer(phys_addr_t paddr)
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+{
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+	return false;
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+}
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+static inline void swiotlb_exit(void)
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+{
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+}
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+static inline unsigned int swiotlb_max_segment(void)
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+{
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+	return 0;
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+}
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+static inline size_t swiotlb_max_mapping_size(struct device *dev)
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+{
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+	return SIZE_MAX;
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+}
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+
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+static inline bool is_swiotlb_active(void)
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+{
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+	return false;
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+}
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+#endif /* CONFIG_SWIOTLB */
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 extern void swiotlb_print_info(void);
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-extern int is_swiotlb_buffer(phys_addr_t paddr);
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 extern void swiotlb_set_max_segment(unsigned int);
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-
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-extern const struct dma_map_ops swiotlb_dma_ops;
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 #endif /* __LINUX_SWIOTLB_H */