lwn.git/arch/arm/include/asm/dma-mapping.h, branch docs-fixes

ARM/dma-mapping: use dma-direct unconditionally

2022-07-07T16:18:57+00:00

Use dma-direct unconditionally on arm. It has already been used for some time for LPAE and nommu configurations. This mostly changes the streaming mapping implementation and the (simple) coherent allocator for device that are DMA coherent. The existing complex allocator for uncached mappings for non-coherent devices is still used as is using the arch_dma_alloc/arch_dma_free hooks. Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann Acked-by: Andre Przywara [highbank] Tested-by: Marc Zyngier

ARM/dma-mapping: mark various dma-mapping routines static in dma-mapping.c

2022-07-07T16:18:56+00:00

With the dmabounce removal these aren't used outside of dma-mapping.c, so mark them static. Move the dma_map_ops declarations down a bit to avoid lots of forward declarations. Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann Tested-by: Marc Zyngier

ARM/dma-mapping: remove dmabounce

2022-07-07T16:18:56+00:00

Remove the now unused dmabounce code. Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann

dma-mapping: move dma-debug.h to kernel/dma/

2020-10-06T05:07:05+00:00

Most of dma-debug.h is not required by anything outside of kernel/dma. Move the four declarations needed by dma-mappin.h or dma-ops providers into dma-mapping.h and dma-map-ops.h, and move the remainder of the file to kernel/dma/debug.h. Signed-off-by: Christoph Hellwig

ARM/dma-mapping: move various helpers from dma-mapping.h to dma-direct.h

2020-09-17T16:43:24+00:00

Move the helpers to translate to and from direct mapping DMA addresses to dma-direct.h. This not only is the most logical place, but the new placement also avoids dependency loops with pending commits. Signed-off-by: Christoph Hellwig Reviewed-by: Robin Murphy

ARM/dma-mapping: remove dma_to_virt

2020-09-17T16:43:24+00:00

dma_to_virt is entirely unused, remove it. Signed-off-by: Christoph Hellwig

ARM/dma-mapping: remove a __arch_page_to_dma #error

2020-09-17T16:43:24+00:00

The __arch_page_to_dma hook is long gone. Signed-off-by: Christoph Hellwig

xen/arm: use dev_is_dma_coherent

2019-09-11T10:43:26+00:00

Use the dma-noncoherent dev_is_dma_coherent helper instead of the home grown variant. Note that both are always initialized to the same value in arch_setup_dma_ops. Signed-off-by: Christoph Hellwig Reviewed-by: Julien Grall Reviewed-by: Stefano Stabellini

arm: use swiotlb for bounce buffering on LPAE configs

2019-07-24T15:29:01+00:00

The DMA API requires that 32-bit DMA masks are always supported, but on arm LPAE configs they do not currently work when memory is present above 4GB. Wire up the swiotlb code like for all other architectures to provide the bounce buffering in that case. Fixes: 21e07dba9fb11 ("scsi: reduce use of block bounce buffers"). Reported-by: Roger Quadros Signed-off-by: Christoph Hellwig Tested-by: Vignesh Raghavendra

dma-mapping: remove dma_max_pfn

2019-07-10T11:17:30+00:00

These days, the DMA mapping code must bounce buffers for any unsupported address. If the driver needs to optimize for natively supported ranges, then it should use dma_get_required_mask. Signed-off-by: Christoph Hellwig Acked-by: Marc Gonzalez Signed-off-by: Ulf Hansson