diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dma-direct.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index 94fad4e7c11e..daa31a1adf7b 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -135,12 +135,20 @@ static inline bool force_dma_unencrypted(struct device *dev) #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, - bool is_ram) + bool is_ram, unsigned long attrs) { dma_addr_t end = addr + size - 1; if (addr == DMA_MAPPING_ERROR) return false; + /* + * The DMA address was derived from encrypted RAM, but this device + * requires unencrypted DMA addresses. Treat it as not DMA-capable + * so the caller can fall back to a suitable SWIOTLB pool. + */ + if (!(attrs & DMA_ATTR_CC_SHARED) && force_dma_unencrypted(dev)) + return false; + if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn))) return false; |