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Date: Fri, 28 Jan 2011 10:44:19 +0530 From: MJ embd <mj.embd@...il.com> To: linux-kernel@...r.kernel.org Subject: equivalent of phys_to_virt in an iommu system Hi, Assuming at core mmu there is a mapping, V1 -> P1 And at the IOMMU for the device to access a region of DDR there is a mapping P2 -> P1. [P2 is the address on which device issues a r/w] Now the device driver does the following. Line 0: V1 = kmalloc(); Line 1: P2 = dma_map_single(V1) Now if later in the driver, there is a requirement to get V1 from P2 what is the primitive in linux ? Also is my understanding of Line 1(above) correct ? -- -mj -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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