kernel/arch/mips/include/asm/dma-mapping.h, branch linux-5.1.y

dma-mapping: add a kconfig symbol for arch_setup_dma_ops availability

2019-02-13T18:12:33Z

Signed-off-by: Christoph Hellwig Acked-by: Paul Burton # MIPS Acked-by: Catalin Marinas # arm64

dma-mapping: bypass indirect calls for dma-direct

2018-12-13T20:06:18Z

Avoid expensive indirect calls in the fast path DMA mapping operations by directly calling the dma_direct_* ops if we are using the directly mapped DMA operations. Signed-off-by: Christoph Hellwig Acked-by: Jesper Dangaard Brouer Tested-by: Jesper Dangaard Brouer Tested-by: Tony Luck

dma-direct: merge swiotlb_dma_ops into the dma_direct code

2018-12-13T20:06:17Z

While the dma-direct code is (relatively) clean and simple we actually have to use the swiotlb ops for the mapping on many architectures due to devices with addressing limits. Instead of keeping two implementations around this commit allows the dma-direct implementation to call the swiotlb bounce buffering functions and thus share the guts of the mapping implementation. This also simplified the dma-mapping setup on a few architectures where we don't have to differenciate which implementation to use. Signed-off-by: Christoph Hellwig Acked-by: Jesper Dangaard Brouer Tested-by: Jesper Dangaard Brouer Tested-by: Tony Luck

dma-mapping: merge direct and noncoherent ops

2018-09-20T07:01:15Z

All the cache maintainance is already stubbed out when not enabled, but merging the two allows us to nicely handle the case where cache maintainance is required for some devices, but not others. Signed-off-by: Christoph Hellwig Acked-by: Paul Burton # MIPS parts

dma-mapping: move the dma_coherent flag to struct device

2018-09-20T07:01:15Z

Various architectures support both coherent and non-coherent dma on a per-device basis. Move the dma_noncoherent flag from the mips archdata field to struct device proper to prepare the infrastructure for reuse on other architectures. Signed-off-by: Christoph Hellwig Acked-by: Paul Burton Acked-by: Greg Kroah-Hartman

MIPS: remove mips_swiotlb_ops

2018-07-27T22:19:59Z

mips_swiotlb_ops differs from the generic swiotlb_dma_ops only in that it contains a mb() barrier after each operations that maps or syncs dma memory to the device. The dma operations are defined to not be memory barriers, but instead the write* operations to kick the DMA off are supposed to contain them. For mips this handled by war_io_reorder_wmb(), which evaluates to the stronger wmb() instead of the pure compiler barrier barrier() for just those platforms that use swiotlb, so I think we are covered properly. [paul.burton@mips.com: - Include linux/swiotlb.h to fix build failures for configs with CONFIG_SWIOTLB=y.] Signed-off-by: Christoph Hellwig Signed-off-by: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/20038/ Cc: David Daney Cc: Huacai Chen Cc: linux-mips@linux-mips.org Cc: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org

MIPS: remove unneeded includes from dma-mapping.h

2018-06-24T16:27:27Z

Keep this file as light as possible as it gets pulled into every driver using dma mapping APIs. Signed-off-by: Christoph Hellwig Patchwork: https://patchwork.linux-mips.org/patch/19552/ Signed-off-by: Paul Burton Cc: Florian Fainelli Cc: David Daney Cc: Kevin Cernekee Cc: Jiaxun Yang Cc: Tom Bogendoerfer Cc: Huacai Chen Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org

MIPS: remove the old dma-default implementation

2018-06-24T16:27:27Z

Now unused. Signed-off-by: Christoph Hellwig Patchwork: https://patchwork.linux-mips.org/patch/19551/ Signed-off-by: Paul Burton Cc: Florian Fainelli Cc: David Daney Cc: Kevin Cernekee Cc: Jiaxun Yang Cc: Tom Bogendoerfer Cc: Huacai Chen Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org

MIPS: jazz: split dma mapping operations from dma-default

2018-06-24T16:27:27Z

Jazz actually has a very basic IOMMU, so split the ops into a separate implementation from the generic default support (which is about to go away anyway). Signed-off-by: Christoph Hellwig Patchwork: https://patchwork.linux-mips.org/patch/19548/ Signed-off-by: Paul Burton Cc: Florian Fainelli Cc: David Daney Cc: Kevin Cernekee Cc: Jiaxun Yang Cc: Tom Bogendoerfer Cc: Huacai Chen Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org

MIPS: use generic dma noncoherent ops for simple noncoherent platforms

2018-06-24T16:26:05Z

Convert everything not overriding dma-coherence.h to the generic noncoherent ops. The new dma-noncoherent.c file duplicates a lot of the code in dma-default.c, but that file will be gone by the end of this series. Signed-off-by: Christoph Hellwig Patchwork: https://patchwork.linux-mips.org/patch/19544/ Signed-off-by: Paul Burton Cc: Florian Fainelli Cc: David Daney Cc: Kevin Cernekee Cc: Jiaxun Yang Cc: Tom Bogendoerfer Cc: Huacai Chen Cc: iommu@lists.linux-foundation.org Cc: linux-mips@linux-mips.org