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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/arch/arm/include/asm/dma-direct.h
..
..
@@ -2,35 +2,47 @@
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 #ifndef ASM_ARM_DMA_DIRECT_H
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 #define ASM_ARM_DMA_DIRECT_H 1
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-static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
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+#include <asm/memory.h>
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+
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+/*
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+ * dma_to_pfn/pfn_to_dma/virt_to_dma are architecture private
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+ * functions used internally by the DMA-mapping API to provide DMA
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+ * addresses. They must not be used by drivers.
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+ */
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+static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
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+{
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+	if (dev && dev->dma_range_map)
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+		pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn)));
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+	return (dma_addr_t)__pfn_to_bus(pfn);
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+}
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+
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+static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
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+{
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+	unsigned long pfn = __bus_to_pfn(addr);
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+
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+	if (dev && dev->dma_range_map)
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+		pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn)));
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+	return pfn;
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+}
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+
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+static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
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+{
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+	if (dev)
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+		return pfn_to_dma(dev, virt_to_pfn(addr));
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+
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+	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
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+}
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+
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+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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 {
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 	unsigned int offset = paddr & ~PAGE_MASK;
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 	return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
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 }
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-static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
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+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
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 {
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 	unsigned int offset = dev_addr & ~PAGE_MASK;
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 	return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
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-}
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-
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-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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-{
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-	u64 limit, mask;
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-
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-	if (!dev->dma_mask)
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-		return 0;
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-
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-	mask = *dev->dma_mask;
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-
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-	limit = (mask + 1) & ~mask;
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-	if (limit && size > limit)
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-		return 0;
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-
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-	if ((addr | (addr + size - 1)) & ~mask)
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-		return 0;
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-
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-	return 1;
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 }
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47
 
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 #endif /* ASM_ARM_DMA_DIRECT_H */