LXR linux/include/linux/dma-iommu.h

   1/*
   2 * Copyright (C) 2014-2015 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __DMA_IOMMU_H
  17#define __DMA_IOMMU_H
  18
  19#ifdef __KERNEL__
  20#include <asm/errno.h>
  21
  22#ifdef CONFIG_IOMMU_DMA
  23#include <linux/iommu.h>
  24
  25int iommu_dma_init(void);
  26
  27/* Domain management interface for IOMMU drivers */
  28int iommu_get_dma_cookie(struct iommu_domain *domain);
  29void iommu_put_dma_cookie(struct iommu_domain *domain);
  30
  31/* Setup call for arch DMA mapping code */
  32int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);
  33
  34/* General helpers for DMA-API <-> IOMMU-API interaction */
  35int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);
  36
  37/*
  38 * These implement the bulk of the relevant DMA mapping callbacks, but require
  39 * the arch code to take care of attributes and cache maintenance
  40 */
  41struct page **iommu_dma_alloc(struct device *dev, size_t size,
  42                gfp_t gfp, int prot, dma_addr_t *handle,
  43                void (*flush_page)(struct device *, const void *, phys_addr_t));
  44void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
  45                dma_addr_t *handle);
  46
  47int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
  48
  49dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
  50                unsigned long offset, size_t size, int prot);
  51int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
  52                int nents, int prot);
  53
  54/*
  55 * Arch code with no special attribute handling may use these
  56 * directly as DMA mapping callbacks for simplicity
  57 */
  58void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
  59                enum dma_data_direction dir, struct dma_attrs *attrs);
  60void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
  61                enum dma_data_direction dir, struct dma_attrs *attrs);
  62int iommu_dma_supported(struct device *dev, u64 mask);
  63int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  64
  65#else
  66
  67struct iommu_domain;
  68
  69static inline int iommu_dma_init(void)
  70{
  71        return 0;
  72}
  73
  74static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
  75{
  76        return -ENODEV;
  77}
  78
  79static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
  80{
  81}
  82
  83#endif  /* CONFIG_IOMMU_DMA */
  84#endif  /* __KERNEL__ */
  85#endif  /* __DMA_IOMMU_H */
  86