driver core: lift dma_default_coherent into common code

Lift the dma_default_coherent variable from the mips architecture code to the driver core. This allows an architecture to sdefault all device to be DMA coherent at run time, even if the kernel is build with support for DMA noncoherent device. By allowing device_initialize to set the ->dma_coherent field to this default the amount of arch hooks required for this behavior can be greatly reduced.

Christoph Hellwig committed 5 years ago

Commit 6d4e9a81 parent 14ac09a13 files · +14 −39Browse files

Showing the changes to kernel (2 of 13 files). Show all

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2 files

kernel/dma/Kconfig +0 −3
kernel/dma/mapping.c +2 −0

kernel/dma/Kconfig+0−3

@@ -33,9 +33,6 @@ config NEED_DMA_MAP_STATE · 32 unmodified lines
33	33	config ARCH_DMA_ADDR_T_64BIT
34	34	def_bool 64BIT \|\| PHYS_ADDR_T_64BIT
35	35
36		−config ARCH_HAS_DMA_COHERENCE_H
37		− bool
38		−
39	36	config ARCH_HAS_DMA_SET_MASK
40	37	bool
41	38

kernel/dma/mapping.c+2−0

@@ -16,6 +16,8 @@ · 15 unmodified lines
16	16	#include "debug.h"
17	17	#include "direct.h"
18	18
	19	+bool dma_default_coherent;
	20	+
19	21	/*
20	22	* Managed DMA API
21	23	*/

driver core: lift dma_default_coherent into common code

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