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06d60728ff
There is nothing really arm64 specific in the iommu_dma_ops implementation, so move it to dma-iommu.c and keep a lot of symbols self-contained. Note the implementation does depend on the DMA_DIRECT_REMAP infrastructure for now, so we'll have to make the DMA_IOMMU support depend on it, but this will be relaxed soon. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* SWIOTLB-based DMA API implementation
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/gfp.h>
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#include <linux/acpi.h>
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#include <linux/memblock.h>
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#include <linux/cache.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/genalloc.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-noncoherent.h>
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#include <linux/dma-contiguous.h>
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#include <linux/dma-iommu.h>
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#include <linux/vmalloc.h>
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#include <linux/swiotlb.h>
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#include <linux/pci.h>
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#include <asm/cacheflush.h>
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pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
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unsigned long attrs)
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{
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if (!dev_is_dma_coherent(dev) || (attrs & DMA_ATTR_WRITE_COMBINE))
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return pgprot_writecombine(prot);
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return prot;
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}
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void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_map_area(phys_to_virt(paddr), size, dir);
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}
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir)
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{
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__dma_unmap_area(phys_to_virt(paddr), size, dir);
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}
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void arch_dma_prep_coherent(struct page *page, size_t size)
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{
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__dma_flush_area(page_address(page), size);
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}
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static int __init arm64_dma_init(void)
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{
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WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
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TAINT_CPU_OUT_OF_SPEC,
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"ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
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ARCH_DMA_MINALIGN, cache_line_size());
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return dma_atomic_pool_init(GFP_DMA32, __pgprot(PROT_NORMAL_NC));
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}
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arch_initcall(arm64_dma_init);
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#ifdef CONFIG_IOMMU_DMA
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void arch_teardown_dma_ops(struct device *dev)
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{
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dev->dma_ops = NULL;
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}
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#endif
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void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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const struct iommu_ops *iommu, bool coherent)
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{
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dev->dma_coherent = coherent;
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if (iommu)
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iommu_setup_dma_ops(dev, dma_base, size);
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#ifdef CONFIG_XEN
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if (xen_initial_domain())
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dev->dma_ops = xen_dma_ops;
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#endif
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}
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