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fece6530bf
Several places want to compute the lower and/or upper bounds of a dma_range_map, so let's factor that out into reusable helpers. Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hanjun Guo <guohanjun@huawei.com> # For arm64 Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Tested-by: Hanjun Guo <guohanjun@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/45ec52f033ec4dfb364e23f48abaf787f612fa53.1713523152.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
26 lines
581 B
C
26 lines
581 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/acpi.h>
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#include <linux/dma-direct.h>
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void acpi_arch_dma_setup(struct device *dev)
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{
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int ret;
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u64 mask, end;
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const struct bus_dma_region *map = NULL;
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ret = acpi_dma_get_range(dev, &map);
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if (!ret && map) {
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end = dma_range_map_max(map);
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mask = DMA_BIT_MASK(ilog2(end) + 1);
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dev->bus_dma_limit = end;
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dev->dma_range_map = map;
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dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
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*dev->dma_mask = min(*dev->dma_mask, mask);
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}
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}
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