swiotlb: Add is_swiotlb_active() function (492366f7) · Commits · 戴 / test

include/linux/swiotlb.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -77,6 +77,7 @@ bool swiotlb_map(struct device dev, phys_addr_t phys, dma_addr_t *dma_addr,
		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)
		@@ -100,6 +101,11 @@ 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);

+9 −0

Original line number	Diff line number	Diff line
		@@ -667,3 +667,12 @@ size_t swiotlb_max_mapping_size(struct device *dev)
		{
		return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
		}

		bool is_swiotlb_active(void)
		{
		/*
		* When SWIOTLB is initialized, even if io_tlb_start points to physical
		* address zero, io_tlb_end surely doesn't.
		*/
		return io_tlb_end != 0;
		}