dma-mapping.c (1337B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2012 ARM Ltd. 4 * Author: Catalin Marinas <catalin.marinas@arm.com> 5 */ 6 7#include <linux/gfp.h> 8#include <linux/cache.h> 9#include <linux/dma-map-ops.h> 10#include <linux/dma-iommu.h> 11#include <xen/xen.h> 12 13#include <asm/cacheflush.h> 14#include <asm/xen/xen-ops.h> 15 16void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, 17 enum dma_data_direction dir) 18{ 19 __dma_map_area(phys_to_virt(paddr), size, dir); 20} 21 22void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, 23 enum dma_data_direction dir) 24{ 25 __dma_unmap_area(phys_to_virt(paddr), size, dir); 26} 27 28void arch_dma_prep_coherent(struct page *page, size_t size) 29{ 30 __dma_flush_area(page_address(page), size); 31} 32 33#ifdef CONFIG_IOMMU_DMA 34void arch_teardown_dma_ops(struct device *dev) 35{ 36 dev->dma_ops = NULL; 37} 38#endif 39 40void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, 41 const struct iommu_ops *iommu, bool coherent) 42{ 43 int cls = cache_line_size_of_cpu(); 44 45 WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN, 46 TAINT_CPU_OUT_OF_SPEC, 47 "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)", 48 dev_driver_string(dev), dev_name(dev), 49 ARCH_DMA_MINALIGN, cls); 50 51 dev->dma_coherent = coherent; 52 if (iommu) 53 iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1); 54 55 xen_setup_dma_ops(dev); 56}