Check if we need to allocate uncached memory for a device given the allocation flags. Switch over the uncached segment check to this helper to deal with architectures that do not support the dma_cache_sync operation and thus should not returned cacheable memory for DMA_ATTR_NON_CONSISTENT allocations.
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| @@ -20,6 +20,20 @@ static inline bool dev_is_dma_coherent(struct device *dev) · 19 unmodified lines | ||
| 20 | 20 | } |
| 21 | 21 | #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */ |
| 22 | 22 | |
| 23 | +/* | |
| 24 | + * Check if an allocation needs to be marked uncached to be coherent. | |
| 25 | + */ | |
| 26 | +static inline bool dma_alloc_need_uncached(struct device *dev, | |
| 27 | + unsigned long attrs) | |
| 28 | +{ | |
| 29 | + if (dev_is_dma_coherent(dev)) | |
| 30 | + return false; | |
| 31 | + if (IS_ENABLED(CONFIG_DMA_NONCOHERENT_CACHE_SYNC) && | |
| 32 | + (attrs & DMA_ATTR_NON_CONSISTENT)) | |
| 33 | + return false; | |
| 34 | + return true; | |
| 35 | +} | |
| 36 | + | |
| 23 | 37 | void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| 24 | 38 | gfp_t gfp, unsigned long attrs); |
| 25 | 39 | void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, |