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/dma-mapping.h>
  24#include <linux/iommu.h>
  25#include <linux/msi.h>
  26
  27int iommu_dma_init(void);
  28
  29/* Domain management interface for IOMMU drivers */
  30int iommu_get_dma_cookie(struct iommu_domain *domain);
  31int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
  32void iommu_put_dma_cookie(struct iommu_domain *domain);
  33
  34/* Setup call for arch DMA mapping code */
  35int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
  36                u64 size, struct device *dev);
  37
  38/* General helpers for DMA-API <-> IOMMU-API interaction */
  39int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
  40                     unsigned long attrs);
  41
  42/*
  43 * These implement the bulk of the relevant DMA mapping callbacks, but require
  44 * the arch code to take care of attributes and cache maintenance
  45 */
  46struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
  47                unsigned long attrs, int prot, dma_addr_t *handle,
  48                void (*flush_page)(struct device *, const void *, phys_addr_t));
  49void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
  50                dma_addr_t *handle);
  51
  52int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
  53
  54dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
  55                unsigned long offset, size_t size, int prot);
  56int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
  57                int nents, int prot);
  58
  59/*
  60 * Arch code with no special attribute handling may use these
  61 * directly as DMA mapping callbacks for simplicity
  62 */
  63void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
  64                enum dma_data_direction dir, unsigned long attrs);
  65void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
  66                enum dma_data_direction dir, unsigned long attrs);
  67dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
  68                size_t size, enum dma_data_direction dir, unsigned long attrs);
  69void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
  70                size_t size, enum dma_data_direction dir, unsigned long attrs);
  71int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  72
  73/* The DMA API isn't _quite_ the whole story, though... */
  74void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
  75void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
  76
  77#else
  78
  79struct iommu_domain;
  80struct msi_msg;
  81struct device;
  82
  83static inline int iommu_dma_init(void)
  84{
  85        return 0;
  86}
  87
  88static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
  89{
  90        return -ENODEV;
  91}
  92
  93static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
  94{
  95        return -ENODEV;
  96}
  97
  98static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
  99{
 100}
 101
 102static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
 103{
 104}
 105
 106static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 107{
 108}
 109
 110#endif  /* CONFIG_IOMMU_DMA */
 111#endif  /* __KERNEL__ */
 112#endif  /* __DMA_IOMMU_H */
 113