Re: [PATCH 5/5] PCI: remove PCI_DMA_BUS_IS_PHYS

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On Tue, 24 Apr 2018 11:16:25 PDT (-0700), Christoph Hellwig wrote:
This was used by the ide, scsi and networking code in the past to
determine if they should bounce payloads.  Now that the dma mapping
always have to support dma to all physical memory (thanks to swiotlb
for non-iommu systems) there is no need to this crude hack any more.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
[...]
diff --git a/arch/riscv/include/asm/pci.h b/arch/riscv/include/asm/pci.h
index 0f2fc9ef20fc..b3638c505728 100644
--- a/arch/riscv/include/asm/pci.h
+++ b/arch/riscv/include/asm/pci.h
@@ -26,9 +26,6 @@
 /* RISC-V shim does not initialize PCI bus */
 #define pcibios_assign_all_busses() 1

-/* We do not have an IOMMU */
-#define PCI_DMA_BUS_IS_PHYS 1
-
 extern int isa_dma_bridge_buggy;

 #ifdef CONFIG_PCI

Thanks!

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxx> (For the RISC-V change)



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