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| author | Paul Burton | 2016-10-05 19:18:16 +0200 |
|---|---|---|
| committer | Ralf Baechle | 2016-10-06 18:02:01 +0200 |
| commit | 20d330645cfb8cfecfb82b369e4d3084e429e68a (patch) | |
| tree | c2e0661dbbb76ad83b2645db4291954bbd19c69d /arch/mips/include/asm/dma-mapping.h | |
| parent | MIPS: dma-default: Don't check hw_coherentio if device is non-coherent (diff) | |
| download | kernel-qcow2-linux-20d330645cfb8cfecfb82b369e4d3084e429e68a.tar.gz kernel-qcow2-linux-20d330645cfb8cfecfb82b369e4d3084e429e68a.tar.xz kernel-qcow2-linux-20d330645cfb8cfecfb82b369e4d3084e429e68a.zip | |
MIPS: Support per-device DMA coherence
On some MIPS systems, a subset of devices may have DMA coherent with CPU
caches. For example in systems including a MIPS I/O Coherence Unit
(IOCU), some devices may be connected to that IOCU whilst others are
not.
Prior to this patch, we have a plat_device_is_coherent() function but no
implementation which does anything besides return a global true or
false, optionally chosen at runtime. For devices such as those described
above this is insufficient.
Fix this by tracking DMA coherence on a per-device basis with a
dma_coherent field in struct dev_archdata. Setting this from
arch_setup_dma_ops() takes care of devices which set the dma-coherent
property via device tree, and any PCI devices beneath a bridge described
in DT, automatically.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14349/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/mips/include/asm/dma-mapping.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h index 12fa79e2f1b4..7aa71b9b0258 100644 --- a/arch/mips/include/asm/dma-mapping.h +++ b/arch/mips/include/asm/dma-mapping.h @@ -32,4 +32,14 @@ static inline void dma_mark_clean(void *addr, size_t size) {} extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction); +#define arch_setup_dma_ops arch_setup_dma_ops +static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, + u64 size, const struct iommu_ops *iommu, + bool coherent) +{ +#ifdef CONFIG_DMA_PERDEV_COHERENT + dev->archdata.dma_coherent = coherent; +#endif +} + #endif /* _ASM_DMA_MAPPING_H */ |