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https://github.com/torvalds/linux
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4720287c7b
This is not being used to pass ops, it is just a way to tell if an iommu driver was probed. These days this can be detected directly via device_iommu_mapped(). Call device_iommu_mapped() in the two places that need to check it and remove the iommu parameter everywhere. Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Moritz Fischer <mdf@kernel.org> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Rob Herring <robh@kernel.org> Tested-by: Hector Martin <marcan@marcan.st> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/1-v2-16e4def25ebb+820-iommu_fwspec_p1_jgg@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on linux/arch/arm/mm/dma-mapping.c
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*
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* Copyright (C) 2000-2004 Russell King
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*/
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#include <linux/dma-map-ops.h>
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#include <asm/cachetype.h>
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#include <asm/cacheflush.h>
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#include <asm/outercache.h>
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#include <asm/cp15.h>
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#include "dma.h"
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void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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dmac_map_area(__va(paddr), size, dir);
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if (dir == DMA_FROM_DEVICE)
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outer_inv_range(paddr, paddr + size);
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else
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outer_clean_range(paddr, paddr + size);
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}
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void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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if (dir != DMA_TO_DEVICE) {
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outer_inv_range(paddr, paddr + size);
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dmac_unmap_area(__va(paddr), size, dir);
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}
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}
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void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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bool coherent)
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{
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if (IS_ENABLED(CONFIG_CPU_V7M)) {
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/*
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* Cache support for v7m is optional, so can be treated as
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* coherent if no cache has been detected. Note that it is not
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* enough to check if MPU is in use or not since in absense of
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* MPU system memory map is used.
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*/
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dev->dma_coherent = cacheid ? coherent : true;
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} else {
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/*
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* Assume coherent DMA in case MMU/MPU has not been set up.
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*/
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dev->dma_coherent = (get_cr() & CR_M) ? coherent : true;
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}
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}
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