replace PCI_DMA_BUS_IS_PHYS with a per-instance flag

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To: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Subject: replace PCI_DMA_BUS_IS_PHYS with a per-instance flag
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 4 Dec 2017 08:35:58 -0800
Cc: linux-kernel@xxxxxxxxxxxxxxx

Hi all,

this small series tries to get rid of the global and misnamed
PCI_DMA_BUS_IS_PHYS flag, and replace it with a setting in each
struct dma_map_ops instance.

Follow-Ups:
- [PATCH 2/3] arm64: don't override dma_max_pfn
  - From: Christoph Hellwig
- [PATCH 1/3] dma-mapping: take dma_pfn_offset into account in dma_max_pfn
  - From: Christoph Hellwig
- [PATCH 3/3] dma-mapping: replace PCI_DMA_BUS_IS_PHYS with a flag in struct dma_map_ops
  - From: Christoph Hellwig

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