Re: [PATCH v3 2/4] dma-iommu: Add iommu_dma_opt_mapping_size()

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On 6/6/22 02:30, John Garry via iommu wrote:
+unsigned long iova_rcache_range(void)
+{
+	return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1);
+}

My understanding is that iova cache entries may be smaller than IOVA_RANGE_CACHE_MAX_SIZE and hence that even if code that uses the DMA mapping API respects this limit that a cache miss can still happen.

Thanks,

Bart.



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