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Diffstat (limited to 'include/linux/dma-noncoherent.h')
-rw-r--r--include/linux/dma-noncoherent.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h
index 9741767e400f..3813211a9aad 100644
--- a/include/linux/dma-noncoherent.h
+++ b/include/linux/dma-noncoherent.h
@@ -20,6 +20,22 @@ static inline bool dev_is_dma_coherent(struct device *dev)
}
#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
+/*
+ * Check if an allocation needs to be marked uncached to be coherent.
+ */
+static __always_inline bool dma_alloc_need_uncached(struct device *dev,
+ unsigned long attrs)
+{
+ if (dev_is_dma_coherent(dev))
+ return false;
+ if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
+ return false;
+ if (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) &&
+ (attrs & DMA_ATTR_NON_CONSISTENT))
+ return false;
+ return true;
+}
+
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
@@ -80,4 +96,7 @@ static inline void arch_dma_prep_coherent(struct page *page, size_t size)
}
#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
+void *uncached_kernel_address(void *addr);
+void *cached_kernel_address(void *addr);
+
#endif /* _LINUX_DMA_NONCOHERENT_H */